My system has been running for 7+ years. And now, NOW, I am seeing two small aptasias. I couldn't even believe my eyes! I haven't added any new rock for at least two years...
Does the stork bring this stuff?
Of course the aptasia is on the rock with my favorite zoas. Does the aptasia harm other corals?
And I agree with TeresaQ, Alyssia, regarding adding more horses. As long as they are CB and QT'd, it's no different than adding a new horizontal fish. I'm afraid I think folks go a bit overboard sometimes with a notion that seahorses are so frail.