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Help!
My Euroreef rs135 which has a gate valve installed is "shutting down" - (bubbles start breaking about 5" below cup vs. normally I have it breaking about 1"-1.5" below the spillover into the cup) every once in a while through out the day and it seems to last for anywhere from 1-5 hours. I'm not sure why this is happening. Hopefully this explanation makes sense. I'm not adding anything new to the tank - and it has just recently started happening. Any reason why this is happening or how I can fix it?
Thanks.
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