I think it differs from situation to situation. Mt tank is 52" in length, and I only use a 325gph powerhead, but my reds don't like it one bit. They basically just ignore it.grosse gurke said:You seem to have a good grasp of what they like as far a gph in a tank and now you are telling me that 900 is too much when
I think all you can do is make recommendations (and I think that was what Nate did, although he could have stated it more strongly) about the gph-to-tanksize ratio, based on your own experiences. I believe any experienced piranha owner (and I view you as an experienced piranha keeper, Jeff) should know that information from hobby sites like Nate's or my own shoud be seen as based on personal experience, because we simply lack the tools and skills to make and back up scientific statements. Info you find on sites like that should be read/accepted with precaution, imo, but it should also be stated on the website itself.
Just my 2 cents.... :smile: