wow, sweet start-up. your have the space in your favour for a nice future set-up.
I wouldnt worry about the cyno, cause all experience that. You want to addresss your triffid problem though, & real quick. They can reproduce like crazy, even in total darkness, & once they have a foot hold, its an absolute night mare to rid the tank of them. They love over feeding, which you dont have that problem yet, & even if you think youve got them with manual removal, chances are theres some triffid tissue left that can re-spawn quite easy.
Copper is easy, but the fact of the matter is, if your planning corals you can scrap that idea, much the pitty too.
yes you are correct, some fish can eat them, butterfly, copperband & some angles dig the taste for some reason, best while the triffids are small if only for the sting factor they can punch at a later date. But then what are you going to do, take the fish back?, these fish are beautiful but belong in larger aquariums or in the ocean cause they grow large, & nip any & all corals without favourtisms.
grab a syringe of pure white vinagar or
kalk liquid & inject the suckers as close to the base of the foot as you can. you might have a fighting chance of heading off a potential pest before it becomes one.
Just in future, & this isnt "I told you so" i would suggest the rock your looking to purchase> look at it hard in the holding tanks, study the organisms that live on it & try to determin friend from foe. if the tanks are hooked up to a protein
skimmer, wonderful, ask the
LFS to drop just enough food to tain the water & see what moves or comes out. Plus i know your starting out, so its easy to say after the fact what to look for, open any marine book under "pests" & you'll have an idea on what to look for.
anyways. i like what your doing with the place, so keep it up.
also glad your loven the marine side.