Heres the updated crew, minus a watchmen goby that just darts around within the liverock.
Heres a bit of info on the Purple tang -
First time i have ever owned a tang, never had a tank big enough, still might be on the small end of tanks but anyway started this guy off in a 20 gal q/t tank. Fish looked fine for about a day or two, was hiding in the cheato, but for the most part looked healthy. Day 3 one eye started to look really cloudy, day 4 both eyes started to look cloudy. Then day 5 one eye got better and then around day 7 both eyes were back to normal. I added Prazipro and Cupremine on day two so i don’t believe these medications would have helped with the eye. I was however feeding with nori soaked in Selcon which I think might have helped.
During this period the tang started to develop what I think was HLLE. It started very slightly above the eyes, and along the jaw line, at first I was hoping it was just flashing from weird angles with lights on the scales, but a couple days later (around day 5/6 in the q/t tank), it was very distinct, and very obvious that it was growing. So i got pretty nervous, did a big water change, fed with nori, soaked in selcon, and hoped for the best.
I was advised by Bob Fenner, from Wetwebmeida, to take the chance and put the tang in the display as the stress of the small tank might have influenced the erosion. So I thought about it for a day, and figured the copper treatment would have already done its job, fish was eating fine, so it was probably the best choice of action.
Going back, 3 weeks ago in anticipation of getting the tang, I removed activated carbon from my tank, and have been doing the normal 15 gal water chance once a week. It’s been about 4 days that the tang has been in my display tank and I am pleased to report that the HLLE has fully healed over. And another great note, the sps in my tank really started to colour up quick in that time frame. I’m not sure if this is a direct result to the carbon for both circumstances, but I don’t think I will be adding it back anytime soon. On the other side of things, there is a faint “sea” smell now that the carbon is out…
Anyway Tang is doing great, and all visual signs of HLLE are gone.