I purchased Darth-Taters (Great Guy, by the way) 28 gallon Nano-Cube , but one of the pumps quit working a few days ago. I replaced it with a 1200 since that is all I had laying around, but it creates too many micro-bubbles when I was using it on the wavemaker. Does anyone have a 600 or 900 laying around that they no longer need. I had several 1200's, 900's etc, at one time, but gave them away, now when I need one..... .