jessp, I have used Berghias plenty of times.I has about 300(not exaggerating) aiptasias in my BC14 and bought 4 berghias . Withing 3 months about 80% of the aiptasia was wipe out. After that i started to inject them with Lime Juice and wipe them all out. Between the juice and berghias. They are great. Once the aiptasia is all gone they simply die since thats their food source. They will multiply untill the aiptasia its gone. I have never heard of Berghias eating any Zoas or any other corals. People tend to confuse them with zoas nudis but they are definetly not.Just make sure you buy them from a reliable seller in case they try to sell you the zoa nudi. Trust me way better that peppermints, and butterflies. Since both of those are hit or miss. Berghias are guaranteed to eat your aiptasia
I bought mine AT a LFS were the lady grew them. $15 buck a pop
Trust me well worth the Money