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Is there anything in your tank that could catch an air bubble. The one i run gets the same thing if the coral have strands of mucus floating in the tank. All it needs is to have a fish stir the sand a release trapped gasses.

The bicolor blenny in the tank does the same thing but only on the algae around his "lair". Sometimes if there isn't much going in around the tank it will dart out of the rock during the day and cling to the glass for a few seconds then repeat the process for a while then go back into hiding.

I didn't think horse shoes were legal or even possible to keep. What species are able to be kept, how do you keep them and where can you get them?