actually, even bubbles from your skimmer that stray into the tank or if your sump cavitates and blows bubbles are dangerous
As the bubble rises through the sponge it kills the surfaces it touches - sensitivity varies sponge to sponge. especially deep water spponges are not used to any air bubble contact
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20G NANO XXtall - Coralife 96W 50/50, 7G acrylic sump/refugium. Won Skimmer, Mag 7 return.
250G (under construction) 111"L x23"D x23"H w/45G refugium, Schuran Skimmer, Dart Closed loop, Dart return.
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