i have the whisper100 on my 120 and one side doesnt work no more and the other side blows 1/2 strenth any more sux i was just geetin on to ask whats a good pump ..tired of usen my powerhead , but works great
Depends on your stock also depends on how turbulent you allow your outlet to be. Id say a 100 would be ok. I personally would hook it up to stir up the sump unless there is dead spots in the tank. Also aqua clear power heads do a great job.