I agree with Fishfreak completely. A UV
will be able to kill Ick Tomonts (sp??) if they float through the UV
at a slow enough rate. The problem is that it needs to be a very slow rate. They are mainly only effective in diminishing the chance for infection. I don't believe a UV
can cure an Ick outbreak unless it's one of the big boys like a 110 watt UV
. Otherwise the parasites on an infected fish can easily reproduce faster then the UV
unit can kill them.
* * guess mode * *
I'm thinking that something is stressing your fish. This is an easy guess because PB Tangs will stress about anything. I've seen them freak out after hanging a new picture on a wall. For a migrating fish I have no idea how they cope with change in the wild!
It could be a tank mate, the tank size, PH, stray voltage, just about anything can stress a PB enough to lower their immunity. I've almost killed one before by carrying a mirror past the tank 8O
I think Cleaner shrimp help by making the tang more at ease. Meanwhile chek all of your parameters again. Once in morning, once in afternoon. Incluse PH, Salinity, temp, ALK
in addition to the standard Nitrogen levels (Ammonia, Nitrite, Nitrate).
What size is the tank? How much free swimming room is there (longest stretch of open water)? This is probably the most common stress producer for PB Tangs.