Willito, I had the single set up on a 54 gallon display tank. I only had it running for 1.5 hours so I'm not the best person to comment on it. It had the stockman silencer and it did run silent but my concern was the noise from the plumbing. You should ask the person who bought mine...victornguyen...he said he already owns 2 lifereefs and was buying mine for a future project. I'd bet he'd be a good one to ask.
Chris
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