I need help with my setup for my 2 turtles, 1 mississippi map and 1 southern painted. I am wanting to upgrade my 20 gallon to a 40 gallon but the problem is i need a stronger filter and i found the aquatop CF-300 canister filter with 264 gph. I need to know if thats too much power good or bad. I also have a feeder fish that never got eaten and i've gotten fond of of him. My turtles are 4 1/2" and 3" so thats why the filter needs to be good strong because i've seen tanks with the fish using all their energy trying to get away. Thanks and the reason i posted this is because i went on a turtle forum and I didnt get any replies and only 10 veiws and i knew i would do better on here. . Thanks -matt