You really don't need to remove anything.
Personally I would go to your drug store and buy a syringe for 25 cents, and get some KALK powder from you LFS
Mix a bit of the kalk with some water and use the syringe to suck it into it. Turn off your flow, so the water is calm and then stick the aptasia with the syringe and inject a bit of KALK paste, remove and then put a bit of it ontop of it as well. Leave all pumps off to keep water calm and let it sit for 5-10 minutes.
Usually one dose works and kills it. If you have more, then repeat the process.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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