Is this a fungus? picture

def not over watered its been like this for like 4 days its got discolering spots that are grayish blackish anything else you want to know ask but i want to know whats wrong with it
 
looks like a phosphorus deficiency,,

Yep... I agree. According to Jorge Cervantes "Grower's Bible" (I love this book) a Phosphorus defieciency:

"Stunted and very slow-growth plants. Dark bluish-green leaves, often with dark blotches....."

It says to treat by lowering the pH to 5.5 - 6.2 for Hydro or 6 to 7 for clay soils or 5.5 to 6.5 for potting soils so phosphorus will become available.
 
id just cut the moldy peices off the plant(but hay thats just me, dont do it unless someone agrees with me)
 
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