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When using a powerhead for water movement in a fish only live rock tank is it advantageous or disadvantageous to introduce bubbles into the waterflow? Why?

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Has anyone been successful keeping a rock beauty angelfish long term. I know they feed primarily on sponge and can be very difficult. Thanks for any insight.

Blue crabs can survive in fresh water for a long time, maybe indefinately. I live in Florida and I can tell you for sure that blue crabs are caught well up into the St. Johns River (which is fresh) And yes these are the same kind of blue crab.