My JDs got ich when I transfered them to there new tank. I tried the Melafix+Pimafix combo, but that just kept them from getting worse. I then got API Tetracycline. Had to treat them for 3 weeks, but it worked. Didn't disrupt the cycle or harm my plants, but I got real tired of looking at the giant pot of coffee in the corner of the room. Just remember to remove carbon, and treat until your absolutely sure the its gone. The problem with antibiotics is you have to annihilate the bad stuff or it could become stronger and antibiotic resistant. This is why I prefer the Melfix+Pimafix route.
Good luck dude, Ich sucks.