After a frustrating week of trying to get the final step of my tank set up Iíve solved the problem and bought the fish last night. If you saw my previous posts the HOB filter had a water cascading sound all night which kept me awake. After trying several different things I finally hit on the magic solution. I kept the HOB functional but put it on a timer and it is off from 10:30 pm to 6:30 am daily. Then thanks to the recommendations I received on the forum I went out and bought a Fluval U3 Underwater Filter. That thing works beautifully. It is on 24/7 so when my HOB shuts down at night the Fluval is still operating. I didnít hear a peep out of it last night. Thanks for the great recommendation.