Koralia 600gph power head older model got it used the front cage is designed to keep larger fish out but it is very easy for a 2 inch green chromis to slip in through to the interior of the power head if it was powerful enough to get past the flow it puts out and I think it was designed with that in mind to let the flow keep the fish out.
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 My aquarium is nothing but a smorgasbord for my cats.....
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