{"product_id":"seachem-polyguard-broad-spectrum-fish-medication","title":"Seachem PolyGuard","description":"\u003cdiv style=\"background: #FFF3E0; border-left: 4px solid #E65100; padding: 10px 14px; margin: 0 0 14px; font-size: 0.95em;\"\u003e\n\u003cstrong\u003eHospital tank use only.\u003c\/strong\u003e Remove all invertebrates before dosing. PolyGuard contains malachite green, which is lethal to shrimp, snails, and corals and can tint the water during treatment.\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSeachem PolyGuard\u003c\/strong\u003e is one of Seachem's strongest broad-spectrum medications, treating bacterial, fungal, and external parasitic infections in freshwater and marine fish. Because it combines several active ingredients, it is the medication to reach for when you are unsure what disease you are facing, when a fish is fighting more than one infection, or when a single-target treatment has not worked. Browse our full range of \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/medication\"\u003efish medications\u003c\/a\u003e and the rest of the \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/seachem\"\u003eSeachem lineup\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eWhat PolyGuard Treats\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExternal bacterial infections, fin and tail rot\u003c\/li\u003e\n\u003cli\u003eBody and mouth fungus, cottony growths\u003c\/li\u003e\n\u003cli\u003eExternal parasites such as flukes and other skin and gill parasites\u003c\/li\u003e\n\u003cli\u003eMixed or unidentified infections where a single medication is not enough\u003c\/li\u003e\n\u003cli\u003eStubborn cases that did not respond to a gentler, single-target treatment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eWhy Hobbyists Reach for It\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad spectrum.\u003c\/strong\u003e Combines antibacterial, antifungal, and antiparasitic agents in one treatment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and marine.\u003c\/strong\u003e Safe to use in both when invertebrates are removed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for the unknown.\u003c\/strong\u003e Ideal when symptoms point to more than one problem or the cause is unclear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to remove.\u003c\/strong\u003e Lifts out with activated carbon and does not linger in substrate or filter media.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003eUse 1 measure (the included scoop) for every 40 litres (about 10 US gallons). Repeat the dose every 72 hours for a maximum of 2 weeks, which is up to 5 doses over the full course. Treat in a dedicated hospital or quarantine tank with all invertebrates removed. After the final dose, perform a partial water change and run fresh activated carbon to clear any remaining medication and tint.\u003c\/p\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eChoose Your Size\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; font-size: 0.95em; margin: 6px 0 4px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #E3F2FD;\"\u003e\n\u003cth style=\"border: 1px solid #BBDEFB; padding: 7px 10px; text-align: left;\"\u003e \u003c\/th\u003e\n\u003cth style=\"border: 1px solid #BBDEFB; padding: 7px 10px; text-align: left;\"\u003ePolyGuard 10 g\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #BBDEFB; padding: 7px 10px; text-align: left;\"\u003ePolyGuard 100 g\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eNet weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e10 g powder\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e100 g powder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eCoverage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eseveral full courses for a small tank\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eabout 10x the 10 g for repeat or large-system use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eone or two tanks, occasional treatment\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003efish rooms, larger tanks, frequent quarantine work\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; font-size: 0.95em; margin: 6px 0 4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px; width: 38%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eSeachem\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eBroad-spectrum medication (antibacterial, antifungal, antiparasitic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eActive ingredients\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eSulfathiazole, malachite green, nitrofurantoin, nitrofural, quinacrine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eForm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003ePowder (measuring scoop included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eWater type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eFreshwater \u0026amp; Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eTreats\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eBacterial, fungal, and external parasitic infections, including mixed cases\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eDose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e1 measure per 40 L (about 10 gal), every 72 hours, up to 2 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eInvertebrates\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eRemove all inverts before dosing; extremely sensitive. Hospital tank only.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eWater tint\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eContains malachite green; may tint water during treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eCarbon removable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #BBDEFB; padding: 7px 10px;\"\u003e10 g, 100 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-sulfaplex-fish-fungus-bacteria-treatment\"\u003eSeachem SulfaPlex\u003c\/a\u003e for milder, single-target bacterial or fungal infections.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-kanaplex-fish-treatment\"\u003eSeachem KanaPlex\u003c\/a\u003e for gram-negative bacterial infections and septicemia.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-metroplex-0-2oz\"\u003eSeachem MetroPlex\u003c\/a\u003e for internal and protozoan infections.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003eWater care and conditioners\u003c\/a\u003e to support fish during and after treatment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #1E88E5; padding-left: 8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes PolyGuard work in both freshwater and marine tanks?\u003c\/strong\u003e\u003cbr\u003eYes. It is labeled for use in freshwater or marine aquaria, as long as all invertebrates are removed first.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it stain my tank?\u003c\/strong\u003e\u003cbr\u003ePolyGuard contains malachite green, which can tint the water and may lightly stain silicone. Treat in a hospital tank and run activated carbon after the course to clear the color.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe for shrimp, snails, and corals?\u003c\/strong\u003e\u003cbr\u003eNo. Invertebrates are extremely sensitive and must be removed before dosing. Always treat affected fish in a separate hospital tank.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I use PolyGuard instead of a gentler medication?\u003c\/strong\u003e\u003cbr\u003eReach for PolyGuard when the disease is severe, when more than one infection is present, when the cause is unknown, or when a single-target treatment has not worked. For milder cases, a gentler option such as SulfaPlex may be enough.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"10 g","offer_id":48755958481115,"sku":"762","price":7.98,"currency_code":"USD","in_stock":true},{"title":"100 g","offer_id":48755958513883,"sku":"765","price":37.52,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/0762-PolyGuard-10-g.png?v=1778231180","url":"https:\/\/squeakysaquatics.com\/products\/seachem-polyguard-broad-spectrum-fish-medication","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}