Your aptasia are huge.
Most creatures won't mess with something that large except maybe the copper band or the file fish.
If you kill them with AptasiaX, Joe's Juice, lemon juice, kalk paste or boiling water they will spread as a bunch of teeny tiny ones. (Not really much else you can do anyway)
But the good news is most of your natural predators will be able to devour the tiny ones at that point without getting stung too bad.
Make sure you have your natural predators in place the week that you kill the huge ones.
Copperband butterfly needs a huge tank. May not eat aptasia but many do. Difficult (nightmare) to get feeding on prepared foods afterwards.
Frail, ships poorly, red blotches on side is walking dead. A few white blobs on fins (not ich) is an ugly, mostly harmless, virus that goes away after a few months. Sorta kinda like the flu.
1 in 5 at LFS may be a good candidate for your 75+ gallon tank. Gets 6-7". Liveaquaria recommends 125 gallons minimum.
Bullet proof on Rods reef food and live blackworms several months after it is happy. [emoji846]
3+ hours of googling and reading before you even consider a copperband please. [emoji4]
File fish - we didn't have any aptasia but this guy looked so cool I wanted him anyway.
Easy to sex. Easy to get/create a pair. Awesome personality.
Oops, eats other soft corals besides aptasia. Not feeding it the $40 neon green Kenya tree!
Back to LFS.
Peppermint shrimp, true (Lysmata wurdemanni) , there are several look alikes. Most likely will solve your problem with the smaller aptasia.
Very, very, very slight chance it will go after zoas and other soft corals.
The other look alikes are more likely to be a problem with other soft corals. All will steal food from your corals if you target feed. [emoji6]
Bergia nudibrancs $$$ Best way to get rid of a heavy infestation. Or any infestation. Um, if you don't have wrasse that eat them.
Add to tank at night well after wrasse are asleep.
Bergias work at night and wrasse are active during the day. If they start out separated you have a better chance of keeping them alive in the wrasse tank. If you have rock with lots of tiny holes to hide in during the day the Bergia have a better chance.
Unfortunately Clean up is not an overnight process.
[emoji53]
Anyone have any other suggestions or clarification that I missed?
Thanks!