Review on Enhance Your Aquarium with the Super Aquatic JVP-102A 1300Gph Circulation Pump: Efficient Wave Maker Power Head with Strong Suction Cup by Kathy Jaramillo

This thing produces TONS of water flow. I do not recommend this for tanks smaller than say 100 gallons. It really moves on my 125; However, it does not crowd the fish, which is ideal for eliminating dead areas in such a large aquarium. I think the complaints/fears that he might suck the fish are unfounded. Sick/dead fish or something tiny like neon tetras can get sucked into the suction filter, but larger fish will not be affected.