Cleaner shrimps eat ich parasites on fishes and on surfaces of LR and LS
You're quote says it all.....they only clean the surface
of the fish/LR
, not under the skin. When Ich gets under the skin, the only real way to treat is with Hyposalinity. Yes Garlic is benifitial to the fish, but it only helps build up their immune system, it does nothing for the disease.
Reef safe ich medications (Kick Ich from Ruby Reef for example). They are usually weak that's y u use this method along with the others
I would stop using that stuff (KickIch) and get it out of your tank immediately. I used it on my main tank and it messed it all up. My Protien Skimmer worked OT for almost 2 weeks straight cleaning out all the crap that KickIch had put in my system.
The only real way to remove Ich from your main tank is to leave it fallow for 6-8 weeks.
See this post on Ich and it will explain it all.
I don't want to repeat what alot of people are already saying, but, Main tank fallow for 6-8 weeks and QT all fish and treat with Hypo. Inverts will be safe in main tank.