Just an update Regarding the sick yellow tang:
I tried and tried but couldn't catch him. Removing the rocks isn't really an option.
So I ended up going go a few LFS
and had a chat and the one I normally go to suggested to use the tri sulfate which has a very low dose of copper which she said won't harm anything because I don't have corals.
I done a 25% water change and used the tri sulfate but the dose i used was a little less then the recommendation on the packet (as per my LFS
saying to do so)
It's been a couple of days and I can start to see the little black dots going. His not rubbing him self any more on the glass.
I also go him some dried seaweed and attached it to the tank which he ate.
Just quickly regarding the sea weed. How long can I leave it in the tank for, or do I need to take it out? It's currently been in for 1 day attached by a clip with suction cup.
Thanks again for everyones help over this. I really appreciate it.