I just purchased a blue spotted puffer for a 40 gallon hexagon aquarium, He is going to be the only fish in it. My question is, I have a 160gph canister filter with I 6” long discharge. Is this going to be too much current for him? When I turn it off he gets out from behind the live rock and swims around his new home. I don’t want it to exhaust its self trying to move. Can I turn it off during daytime and run it only at night?