I have used the Aiptasia-X with some success. Multiple applications needed sometimes. I have used Berghia and they do work but noticed your comment to bad... Could have used a couple more but they are doing a good job no question. I had also read where someone was using the holdfast for corals.. so I just deployed this tactic a couple days ago. The nice thing about this is you can cover and press it into the cracks they hide in. I covered 1 for 2 days and peeled it off and Aiptasia gone. Persistence is the key..