Morning all,\n\nI need a little advice. \nMy tank had massive issues with algae which ice been battling with, with some help and advice from people on here and the lfs. \nParameters have been ok. Apart from the obvious false negative on my PO4, since I had algae.\nI found a dead fish on the morning after noticing my clown fish acting strangely on the bottom. So fished out the dead mandarin and watched the clown. The clown got worse so I put him in a different set up incase he had got toxic poisoning from the mandarin.\nRefreshed my carbon. Then all my fish started showing the same issue quite quickly. So I did a 60% water change incase it was toxic release. But still lost all the fish. Apart from the clown I had transferred out.\nThat night I found a type of sea slug of sorts lying in the sand bed i never knew I had (hitchhiker) . I did grab it with some tweezers to see what it was as it looked like floating plastic at first. It was alive. \nThe next morning I go down to the whole sand bed covered in dying bristle worms and other worms. Apart from my hermits everything was dead. Including my mushrooms ,acans and leather coral peeling away and rotting. So I do a big water change clean all the dead out. \nAfter a couple of days I put the clown back in to test it as all parameters were reading good. \nHes doing fine and my zoas have finally opened after several weeks of being closed due to algae. But the toadstools half has rotted so will cut out the bad parts. And my acan is skeletal. With only a small part still fleshy. My Duncan is just covered in brown slime. (Probably disease due to stress)[ATTACH=full]25104[/ATTACH] [ATTACH=full]25100[/ATTACH] [ATTACH=full]25101[/ATTACH] [ATTACH=full]25102[/ATTACH] [ATTACH=full]25103[/ATTACH] [ATTACH=full]25104[/ATTACH] [ATTACH=full]25105[/ATTACH] [ATTACH=full]25106[/ATTACH]\nSo do you thing the corals will pick back up? \nObviously it was something toxic that wiped my tank out. Devastating.