I currently have a failing Eheim Compact 3000 that I feel never provided enough circulation through my sump. I ordered a Sicce 4.0 on a black Friday sale. Will this be too much pump for my tank? They say It is adjustable. I don't have a fuge or anything in my sump so what harm can more flow do? I have about 5' of head that the pump needs to push water up. Thanks.