Lost all fish in one day then clowns a week after now only have a banana wrasse (Will detail more down below any help is appreciated)

[Reef_Tanks]

So one day i was feeding all my fish a Blue tang, Bristletooth tang, Flame Hawk, six line wrasse and a blenny.

Looked at my skimmer the next day it was greenish liquid was thought to be a nopox overdose still think it was because my auto doser wasnt working just for the nopox then i got in working that night next day all dead but Clownfish and a Banana wrasse.

Now it's a week later the skimmer is skimming properly the color is no longer green its brown as it should be woke up again to see my 2 clowns dead??? Only have a banana wrasse left out of all my fish which were super expensive for me and i can only presume that might day in the coming days.

My question to the more experienced people since that day that i lost nearly all my fish that one night the others weren't as active as previous so could it still be from the nopox overdose or is there something more at play? Also no signs of disease no spots no noticeable thing on the fish just super deflated now ive lost it all pretty much.

Appreciate any help :|

 

[slingfox]

To get more help you should post more info including key water parameters, description of your basic tank setup, picture of the full tank, whether you quarantine your livestock, any recent changes to the tank, etc.

 

[Reef_Tanks]

To get more help you should post more info including key water parameters, description of your basic tank setup, picture of the full tank, whether you quarantine your livestock, any recent changes to the tank, etc.

All water was good couldnt remember the exact measuremnts for that day but the only thing a tiny bit wrong was the mag that needed a little boost.
Tank is 326 liters and i had bought nothing in months so all those fish were good for months then just out of the blue.
I said that the skimmer was skimming green liquid which i was told could be from a nopox overdose so thats all ive got unfortunately