Least Killifish

The Least Killifish, Heterandria formosa g.br. is the world’s smallest livebearer, growing to just about 1 inch long. These tiny fish shine in shades of green, blue, and yellow, and they swim gently through plants and decorations. Their peaceful nature makes them great for community tanks and small aquariums.

What makes the Least Killifish extra special is that it gives birth to live, fully formed fry instead of laying eggs. Watching the babies swim right away is like seeing a little science lesson in your tank. These fish are also tough and do well in many water conditions, so both new and experienced hobbyists can enjoy their bright colors and fascinating breeding behavior.

Adult Size: 1.5 inches

Please Note: All fish shipments have a 100% Live Arrival Guarantee when shipping with FedEx Overnight (1 Day) option. All other options void our Live Arrival Guarantee for fish. 

Our Tank Parameters

• pH: 5.0 to 7.5
• Gh: 8 to 16
• Kh:  4 to 7
• TDS: 180 to 250
• Temp: 68 to 79

Tank Recommendations

• Plants:Guppy Grass, water sprite, java ferns
• Wood:Mopani, Malaysian driftwood
• Substrate:Brightwell Rio Cafe or Rio Escuro