I got a topfin 8000 which is quiet and powerful as hell, I have it running a 48" diy bubbler in my 150g deep tank, my under gravel filter, and my volcano bubbler in my 55g and the bubbles are hellllaaa strong. I took a T piece and plugged two outlets into one for the 48" so that way I was using all the outlets though. Works great highly recommend it, and has better reviews than rena's, I dont have a pad under mine, and its on a dresser and I cant hear it. and its about $37 cheaper than rena's highest pump