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.
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