Here’s my issue. My tank was fallow from may to aug. aug I added 3 fish that were qt. 2 clown fish and a goby. I have not added anything since. In November I fought bubble break out and now is gone. And now I’m fighting an aptasia outbreak. I’ve been blasting it with kalk but it seems to be spreading. How does this happen when you are not introducing anything to the tank. And what can I add to eat this crap.