Another way to trap the microbubbles would be to have the filters overflow into a breeding net cage, like they sell for guppies. Fill it with some chaeto & you would have a simple, inexpensive solution to the problem. Also, seahorses need to be fed at least 2 or 3 times a day. That makes for a high bioload, so a plumbed tank with a large in-sump skimmer is a bonus for dealing with the high nutrient load of a seahorse tank.
Anthony
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