well ill rephrase my saying... when i used it, ick dissapeared...completely. yet... the only fish who got it agian was my hippo tang...then again hippos always get ick. his ick though never did spread to others. if i
saw some ick on my hippo i would either leave it, and it would randomly the next day disapear the next day or two, or would do one dose and would be gone the next day or so. did any of my other fish ever get it again? no. did the hippo? yes. but only the hippo. around 6 months ago i did my last dose of kick ick primairly because the hippo had it. once it was gone, it finally was completely gone. never saw it again. was i happy with kick ick...yes. was others? eh. like i said, hit or miss.
now with my other friends who had it... none have hippos. i know two people that said they used it for weeks and then it finally went away. took a long time. most people use a bottle and if it does not work give up. the others said within less then a week it was gone it NEVER came back. still to this day after a year later...ick free. i know because i am personal friends with them. everyone is going to have there own opinions obviously. there will be some that liked it and some that wont. does it hurt to try? no. for your large size tank... its worth a try.
to do a qt tank is obviously the best choice and i agree, i have one myself. i use it when i get new fish. i broke it down awhile ago because i told my self im not adding anymore fish. never did. i did not use it to put already existing fish i owned in it. its impossible to catch some fish at times with a whole reef tank. my largest tank is only a 72g, which i know is not that big but i know how hard it is to catch fish with alot of lr. to break a whole tank down only for 2 fish with ick comes down to the line of saying "should i break it down just for two fish? or try products". you claim you did catch your one fish but it never ate in the qt tank. understandable. depending on what your qt tank consists of either it being copper. low salt levels, ect... its stressful obviously. its a smaller tank and nothing really going on in it except maybe a few pvc pipes. so not eating is a big possibility that would happen. anyway, what im trying to say is that i feel what you are doing is right. it is worth a shot. if it works, HORRAY!!! if not...damn time to try something else. like i said. this is all my personal experience and only an opinion. others may disagree and thats fine. opinions are like a-holes, some of them stink. no one is going to stop you from doing what you want. and i will admit im not an expert. ive only been doing reefing for around maybe 5 years. i still have ALOT to learn. could my opinion work? maybe. could i be wrong? yea there is a chance. lets just hope it works, thats all. ick sucks. it sucks alot. but if using kick ick works for you..HORRAY, you are one of the bunch that i know that it worked for! good luck.