Just installed the Vortech MP20 on my 48" wide/65g rimless and it performs great. It's very sleek and the design helps keep the power cord clutter minimal. The flow is very broad and provides current all the way to the other end of the tank. I have fine substrate and the current is gentle enough not to disturb the sandbed. When you fine-tune the alignment of the magnets, it's VERY quiet! I'm glad I went with the MP20 (instead of the 40, but can always upgrade later) since this one unit seems to provide more than adequate flow, and my sump return line provides opposing current.
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