Naw, it would be fine. Think about it this way. With HOB you would need a turnover rate of around 10x an hour witch would be 900 gph! and would not kill any fish. The fx5 does around 650? gph with media and head height. I have had an xp3 on a 30g, along with a powerhead, still no current worth killing a fish.amehel0;1058664; said:you cant over filter but in a 3x2x2 or a 3x1.5x1.5 the current created yould kill the fish unless they were "built" to swim constantly.
ken 429;1059889; said:279.99 is way over priced for an xp3 try bigals online they are going for 89.00 or better yey check out an ehiem