It's funny ( not funny) how fish/ inverts behave differently in different tanks/ environments- the MM never even looked at aiptasia in my tank, but is most certainly the culprit that ate @Lovefish77 black widow and rock flower nems. I have an emerald crab in my 75- haven't seen it in over a month, but showed itself today- only picks at algae, some say they've eaten fish and had no impact on the bubble algae in a different tank some people swear that asterina stars multiply like crazy and eat zoas- I've had just a few in my tank for over 2 years- no population explosion and no missing zoas, and all damsels are nasty- well i have 4 different ones in my 75g and all get along- Fiji devil, pink, Springer and TalbotI didn't notice any negative effects from mine the few weeks it was here. I have a bubble tip and 3 rock flowers nems.