My tank is/was full of Aiptasia. The substrate is covered not as thick as grass, but close enough. Aquascape had it popping up all over. A few weeks to a month ago my return pump started sucking in air somewhere and is producing micro bubbles throughout my display tank. Same size bubbles as when a protein skimmer is having discharge bubbles getting sucked up into the return. I should have fixed it, but honestly, it is a pain to take it apart and put it back together again. Having a newborn and football to go to/watch I let it go and I honestly don't mind the tiny bubbles in my tank. About a week ago I noticed that my substrate is 3/4 clear of Aiptasia. The remaining are closed up and nearly flat with the substrate. The same thing is happening to the Aiptasia on the aquascape. Now I am having an issue with high calcium of ~550 and DKH of 10-10.2, but I am thinking the microbubbles are what is making them recede. Will keep everyone updated, but this might be a little trick to beat them down when they are taking over a tank to let some natural predators take over.