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If the spots are fluffy you could be dealing with columnaris.
Plus he has some scabs on the body and he dosn't look well to me i would say it's all bacterial.
How many gallons is the tank, plus full fish stock of how many and which kind.
Can you post water stats in ammonia,nitrite,nitrate,and ph.
Its difficult say, i would also say it is bacterial, but a more effective med for this situation i think would be Pimafix, which can treat internal & external plus fungal infections in one go .