#ed_op#DIV#ed_cl#Hi all, thanks for all the good advice. I do realise that the overcrowding probably has alot to do with state the tank is in. And yes, I did introduce some new fish in the tank and I do have some very aggressive fish - FEMALE maroon clown, an African clown and damsels.#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#Well, I lost the clown trigger - I had moved it to a hospital tank but he was too far gone... saaad (was my favourite !).#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#I continued with the Oomedik Coral solution and the good news is that there is improvement - the Naso has started to eat a little (but still only lettuce and nothing else... got to do something about this later), the emperor stopped scratching for a day but then started a little (much much less) when I stopped the medication, so I restarted the medication again ! The rest of the fish looks quite ok. Unfortunately I cannot catch the emperor out, he's just too fast so I treated all the fish together, probably good given some the advice above to eradicate all the parasites from all the fishes.#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#I've also increased the amount of bio materials in the filter tank dramatically - addeddouble theamount ofAqua clay and some BioHome. I am also thinking of putting in a denitrifyer to keep the Nitrate in check. Hopefully, after a month, the filter system will be able to cope with the amount of fish. Unfortunately, there is already too much fish, so the best I can do now is to try to improve the filtration system (and do water changes). Am also thinking to getting a larger filter tank 2.5 ft and higher, but am worried that this may cause more harm than good in the immediate term (re-cycle the tank ?).#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#BTW, scaleless fish cannot be treated with copper - does tangs and triggers be considered as scaleless ? If so, it was a good thing I did not use copper to treat them !#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#Thanks again for the advice#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#Rdgs#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#shlim944#ed_op#/DIV#ed_cl#