Medaka Tankmate Guide — Keeping Shrimp and Snails in Medaka Tanks

The Role of Tank Mates in Medaka Tanks

Adding shrimp and snails to a medaka tank offers many benefits. They function as "cleanup crew" helping maintain the tank's ecological balance through algae removal, waste processing, and water quality stabilization.

However, there are risks of impacts on breeding and predation, so it's important to understand each species' characteristics before introducing them.

Red Cherry Shrimp: The Classic Medaka Tank Mate

Red Cherry Shrimp are highly compatible with medaka and easy to handle even for beginners.

Benefits: - Clean thread algae and leftover food - Small size means they don't chase medaka - Easy to breed and multiply naturally

Precautions: - Adult medaka may eat shrimp fry under 1cm - Shrimp may also eat medaka eggs and fry (separate containers recommended if prioritizing breeding) - Sensitive to sudden water quality changes; careful acclimation required

Stocking guideline is roughly 5-10 shrimp per 10 liters. Providing plenty of hiding places (willow moss, watersprite) improves fry survival rates.

Yamato Shrimp: Unbeatable Algae-Eating Power

Yamato Shrimp are larger than Red Cherry Shrimp (4-6cm) and have significantly superior algae-eating ability.

Benefits: Powerful cleaning ability that removes stubborn algae (filamentous green algae, black beard algae)

Precautions: - Their larger size means they may predate on small fry and young shrimp - They don't breed in freshwater (require brackish water, so they won't naturally multiply) - Sensitive to high temperatures (over 28°C)

Recommend limiting introduction to 1-2 individuals in medaka tanks, and avoid adding them to tanks with small medaka fry.

Ramshorn Snails: Water Quality Specialists

Ramshorn snails are unique mollusks that provide a "filtering effect" in medaka tanks. They feed on suspended matter and algae in the water, filtering them through their bodies, and can clarify green water.