I can't say I'm that worried by it. I'd be curious why people had it fail on them because I've stopped and started my tank a ton of times now and it has never failed to restart. There aren't any bubbles stuck in the u-tube either, the flow is fast enough it pushes them right out.
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My build thread:
http://reefcentral.com/forums/showthread.php?t=2548422
Current Tank Info: 65 gallon mixed reef, Eshopps sump and HOB overflow, RO-110int skimmer, Reefbreeder 32" photons V1.
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