I had a problem with black ich on my yellow tang.
I gave him a FW
dip for 30 seconds each time the spots appeared - that knocked them off right away, but they kept coming back a few days later.
Started running a strong UV
filter (24w), and no more spots. I got one way stronger than I probably needed for my tank, and made sure I'm running it at the lowest flow rate I can, to kill anything that goes through it.
I'd assume UV
would work for normal ich, but the problem is that water flow fast enough to be running enough water through it to get them all before they attach to a fish, but slow enough to kill them.
180G build thread
180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI