Help Me Please

[digital_fish]

Hi, I have had a 15 gallon Salt Water Aquarium for about a year that I got for free. I didn't know anything about SW aquariums prior to putting this one together but I did uising the 2 cheap aquaflow filters that it came with and just wung it. And for one year I had a perfect system. I had 2 clowns, 2 B/W damsels and a blue tang. Also a red shrimp I picked up somewhere.

Until just recently I wanted a nicer Aquarium and I bought a 32 gallon with a Fluvial 205 filter. My lights are the basic cheap florecent ones that say they're good enough for SW Fish but I know I want nice Cora Life ones because I want to get into the coral reef tanks. I moved everything over slowly and all was perfect (except my shrimp died randomly) until I put in a Yellow Tang and a new Cleaner Shrimp. My blue tang developed white spots a couple weeks after I put the yellow tang in and the guy at the fish store said it could be SW Ick and to give the ifsh a fresh water dip and that could help and I thought it must have worked because for a few days the fish looked good.

But last night it looked like more spots were back and today my blue tang was dead when I woke up. And I suspect the yellow tang might have small spots starting now but it is hard to tell. What should I be doing now? Will my other fish get it? Should I have a protien Skimmer by now? Can anyone tell me any other things I should be doing to make a healthier tank? Now many fish should a 32 gallon tank have? Does SW Ick wreck my live rock?

Sorry for a zillion questions, and I hope someone can help me?!