{"product_id":"silver-dollar-metynnis-argenteus-freshwater","title":"Silver Dollar (Metynnis argenteus) | Live Freshwater Community Fish","description":"\u003cdiv style=\"background:#E3F2FD;border-left:4px solid #1E88E5;padding:10px 14px;margin:0 0 14px;font-size:0.95em;\"\u003e\n\u003cstrong\u003eIn-store pickup only.\u003c\/strong\u003e Pick up at \u003cstrong\u003e1885 Braselton Hwy, Suite D, Lawrenceville, GA\u003c\/strong\u003e.\u003cbr\u003e\nYour order is reserved — we hold off on bagging until you arrive, so it stays healthy in its display tank.\n\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSilver Dollar\u003c\/strong\u003e (\u003cem\u003eMetynnis argenteus\u003c\/em\u003e) is a peaceful, beginner-friendly schooling fish from the Amazon Basin — and one of the most rewarding \"big fish\" you can keep in a community tank. Closely related to piranhas but with a thoroughly herbivore diet, Silver Dollars cruise in tight schools through the middle and upper water column, their bright silver bodies catching every flicker of light. They thrive in larger tanks with similarly-sized peaceful tank mates. See more of our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/fresh-water\"\u003efreshwater livestock and supplies\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eCare Guide\u003c\/h3\u003e\n\u003cp\u003eSilver Dollars are hardy and forgiving once their basic needs are met. The non-negotiables: a large tank (75 gallons minimum for a school of 5–6 adults), a school of at least 5 — they get extremely stressed alone or in pairs — and a vegetable-heavy diet. They are voracious herbivores and \u003cstrong\u003ewill demolish most live plants\u003c\/strong\u003e, so plan on tough plants like Anubias and Java Fern tied to driftwood, or use silk\/plastic décor. Provide open swimming space across the tank; they're fast and need room to school.\u003c\/p\u003e\n\u003cp\u003eSoft, slightly acidic to neutral water mirrors their Amazonian origin, but they tolerate a wide range. Strong filtration is important — these are messy eaters — and weekly 25% water changes keep them in top color and health.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 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%;margin:6px 0 12px;font-size:0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;width:40%;\"\u003e\u003cstrong\u003eCommon Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eSilver Dollar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eScientific Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cem\u003eMetynnis argenteus\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eFamily\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eSerrasalmidae (related to piranhas — but peaceful herbivore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eAmazon Basin, South America\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eCare Level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eBeginner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eDiet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eHerbivore — vegetable matter, blanched veggies, herbivore pellets, occasional protein\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eLifespan\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e10+ years with good care\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eAdult Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e4–6 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eWater Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eFreshwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eTemperament\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003ePeaceful, schooling — keep in groups of 5+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eMinimum Tank Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e75 gallons for a school\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eTemperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e75–82°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003epH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e5.5–7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003ePlant-Safe\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eNo — will eat most live plants (Anubias \u0026amp; Java Fern usually OK)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest tank mates:\u003c\/strong\u003e larger peaceful community fish that won't be confused for food. Good matches include \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/koi-angelfish-pterophyllum-scalare-freshwater\"\u003eangelfish\u003c\/a\u003e, larger gouramis, peaceful cichlids, plecos, larger catfish, and bottom-dwellers like \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/panda-cory-corydoras-panda-freshwater\"\u003ecory cats\u003c\/a\u003e in groups.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAvoid:\u003c\/strong\u003e very small fish (neon tetras, guppies, ember tetras) that fit in their mouth, fin-nippers (tiger barbs), and aggressive cichlids. Also avoid prized live-planted tanks — Silver Dollars will sample everything green.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eRecommended Foods \u0026amp; Supplies\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-nutridiet-herbivore-tabs-85g-probiotic-sinking-fish-food\"\u003eSeachem NutriDiet Herbivore Tabs\u003c\/a\u003e — sinking herbivore staple, ideal for Silver Dollars.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-prime-complete-concentrated-water-conditioner\"\u003eSeachem Prime\u003c\/a\u003e — essential water conditioner for water changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/galapagos-cholla-wood-branches-6-inch-3-pack-shrimp-pleco\"\u003eCholla Wood\u003c\/a\u003e — natural driftwood that gently softens water and looks at home in an Amazon biotope.\u003c\/li\u003e\n\u003cli\u003eBlanched zucchini, cucumber, and spinach — Silver Dollar favorite treats.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/nutrition\"\u003eBrowse all aquarium foods\u003c\/a\u003e — pellets, flakes, wafers, and more.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 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\u003eDo I really need a 75-gallon tank?\u003c\/strong\u003e\u003cbr\u003e\nYes. Silver Dollars get 4–6 inches and need a school of 5+ to feel secure. A 75-gallon is the practical minimum for the footprint and water volume; a 90 or 125 gallon is even better for a long-lived, full-grown school.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill they really eat my plants?\u003c\/strong\u003e\u003cbr\u003e\nAlmost certainly. Silver Dollars are voracious herbivores. The only live plants that reliably survive are tough, low-palatability species like Anubias, Java Fern, and Bolbitis — and even those can get nibbled. Most keepers use silk\/plastic décor or focus on driftwood and hardscape.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre they really related to piranhas?\u003c\/strong\u003e\u003cbr\u003e\nYes, they share the family Serrasalmidae — but unlike piranhas they are dedicated herbivores with no aggressive tendencies toward tank mates. Think of them as the gentle cousin.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I keep just one or two?\u003c\/strong\u003e\u003cbr\u003e\nPlease don't. Silver Dollars are obligate schooling fish — kept alone or in pairs they become stressed, skittish, and prone to disease. Always buy in groups of 5 or more.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre they jumpers?\u003c\/strong\u003e\u003cbr\u003e\nYes, especially when startled. A tight-fitting lid is required.\u003c\/p\u003e\n","brand":"Squeaky's Aquatics","offers":[{"title":"Default Title","offer_id":48790225486043,"sku":"450572","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_fa221504-5bdf-446c-b78c-656eb5c3472c.jpg?v=1779225910","url":"https:\/\/squeakysaquatics.com\/products\/silver-dollar-metynnis-argenteus-freshwater","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}