Hikari Dark Rock Cave | Aquarium Hide for Bettas, Shrimp & Plecos

The Hikari Dark Rock Cave is a lightweight, natural-looking aquarium hide that gives shy fish and inverts a place to retreat, sleep, and feel safe. Realistic stone texturing blends seamlessly into freshwater or saltwater scapes, and the open back makes it easy to clean — no dead zones, no debris traps. Available in three sizes to suit nano shrimp tanks all the way up to community setups with plecos and loaches.

Pair it with the rest of our freshwater aquarium supplies for a complete, low-stress home for your fish.

Why You'll Love This Cave

• Natural rock look — sculpted texture and dark matte finish that mimic real river stone.
• Aquarium-safe materials — non-toxic resin, won't alter pH or water chemistry.
• Lightweight — easy to position without crushing substrate or scratching glass.
• Open ends — multiple openings allow easy entry, exit, and water flow.
• Freshwater & saltwater safe — suitable for tropical, planted, betta, shrimp, and reef tanks.
• Three sizes — Small, Medium, and Large to fit any tank and any tenant.

Best For

• Bettas — a quiet retreat from bright lights and active tankmates.
• Shrimp colonies — Neocaridina, Caridina, and Amano shrimp use the cave as a molting and breeding sanctuary.
• Plecos & bristlenose — daytime hideout for nocturnal scavengers (Small/Medium for juvenile/dwarf plecos; Large for adults).
• Kuhli loaches, corys, and dwarf cichlids — natural cover that reduces stress.
• Small saltwater fish & cleaner shrimp — a reef-safe hide for blennies, gobies, and Lysmata shrimp.

Specifications

Recommended Pairings

• Halfmoon Male Betta — pair the cave with a stunning solo centerpiece fish.
• Blue Diamond Neocaridina Shrimp — colorful colony shrimp that love hiding spots.
• Rili Red Shrimp — eye-catching reds against the dark cave.
• Ocean Nutrition Brine Shrimp Plus Flake — quality daily food for your hiders.
• Browse all freshwater supplies.

FAQ

Is this cave safe for shrimp?
Yes — the resin is fully aquarium-safe, and the smooth interior won't snag delicate shrimp or fins.

Will it sink on its own?
The Dark Rock Cave is dense and sinks immediately — no soaking or weighting needed.

Can I use it in a saltwater tank?
Yes. The non-porous resin is reef-safe and will not leach.

How do I clean it?
Pull it out at water-change time and scrub with a soft brush in tank water. Never use soap or chemical cleaners.

What size should I pick?
Small fits nano tanks (5–10 gal) and shrimp; Medium is the all-around community-tank size (15–40 gal); Large is for grown plecos, larger loaches, or tanks 40 gal+.