Help! Film covering all fish

struggle

New member
I had a nitrate/nitrite spike the other day. Changed to sand in tank 2 weeks ago. My kole tang was looking very stressed. Did 2 water changes and have the nitrate/nitrite's under control. Fish were looking better yesterday. Today all the fish have a white film on them and my tang and mandrin are near death. Looks like thier skin is sloughing off. If anyone could give any suggestions. Very stressful. No hospital tank available.

Any help would be appreciated.

R
 
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