IMO, even critters or fish are not a sure fire thing.
Best bet is to go to the local drug store and buy some syringes, then get some kalk powder. you mix up some RO water with powder, put in syringe and inject each. Usually will kill them in one shot.
I use this method with aptaisa, mushrooms and things I can't easily get out.
Good Luck!
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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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