is it too late ?green mushroom

Check all of your water params, What type of lighting is it under, and how did you acclimate it to your tank? Looks like a water quality/acclimatization issue.
 
lthanks for the answer
light 2x actinic , 2x bleu sky , 38 w sera
water ammonia 0 , nitrite 0.5 ,nitrat 15 .
aclimatisation one h. water mixing
do you think it is reversible ?
 
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