Aiptasia don't grow in my sump, I think it may be due to my exposed UV lights. I just added another UV tube light in my sump, I need to keep the lights covered to protect my eyes. Just yesterday I decided to turn off the UV lights to see what will happen, it is not helping me rid my dinos. I tried every thing that was suggested on R2R and more but nothing helps so I will stop my UV for now, that is one thing I haven't tried yet.Looks like I should have been monitoring this thread. It is great to see the conversations about this amazingly annoying issue.
Tank Update
Turns out that if I turn down the flow rate of the pump it stops sucking in air. That problem ended up being an easy fix. I haven't had bubbles in my display tank since sometime in December. The Aiptasia is starting to come back. I can see little ones on my power heads and a few of the bigger ones that were in the substrate but protected by rocks are starting to come out.
There have been questions about my water chemistry. Well, I am still playing mad chemist it seems. I am trying to run ALK at 9.5-10 with Tropic Marin All-For-Reef and can't keep my calcium below 550. I have been switching between ALF and 2 part to keep my ALK up and try to keep my calcium below 500. During this entire time, the Aiptasia that is in my sump has been alive and well. They are unfortunately growing really well and have multiplied but mostly in the sump. This might be how the new growth in the DT is coming along.
I am no scientist just a techy that has an aquarium, but it does seem to point that the bubbles were part if not the solution in suppressing the Aiptasia in my display tank. The growth in my sump leads me to believe that water chemistry didn't have an impact. The only other major difference is lighting. Obviously, my DT has a higher par and a different spectrum.
I am now waiting for more growth in my DT and will hit it with the bubbles to test my theory a second time. If this works, I might turn on an air stone at night in my sump to pump bubbles into my DT. See if that keeps them suppressed and I wouldn't have bubbles in my DT during normal viewing hours.