Thanks buddy that’s very helpful. I think I’ll give that bacteria a go. That’s the first I’ve heard of it. I added 4 nudis maybe 5 months back. I’m guessing they’re dead. Haven’t seen them and aiptasia is worse. I don’t want to keep throwing $100 worth of nudibranches in if I don’t know if they’ll make it again or do any damage. Leaning towards throwing some peppermint shrimp in currently.I've been breeding nudibranches, I have a queue but can help you out. You probably can't use that and F-aiptasia at the same time in a small tank like yours since the nudis will get nuked.
As for the dinos, try adding some bacteria. I never went through a dino phase in either my 32 gallon display or my 10g backup tank, but for whatever reason I had them in both of my 2.5 gallons I set up in December for nudibranch breeding. Just adding microbacter 7 didn't help, but I had Aquaforest Life Bio (bacteria socked media rocks) which I added in a media bag and Aquaforest Life Source and it got rid of the dinos in a week.
Little caveat on the Aquaforest Life source, it has black sand pieces in it which are magnetic. Since I didn't want that in the tank, I bought a powerful magnet on Amazon and then put the Life source in a small cup with tank water to thin it out and then use the magnet to keep the pieces in the cup and pour the rest in the tank.
I don’t know, my current plan is to turn the 2nd little tank into a frag tank. Get rid of all of the rock work and really hammer down on the aiptasia. I may just go FOWLR with my main display.