Ok i have a 75 gal tank with live plants the following fish

1 x tiger loach
2 x catfish
4 x black widow tetras
3 x bueniseries
1 x male fighter
1 x female fighter
6 x dannios
6 x mollies
8 x platties

and a nursery net with baby mollies (waiting on another tank to finish cycling)

The problem is my black mollie gave birth about 2 weeks ago and now she has developed what looks like grey patches on her body it looks as if the black has dulled, she is also looking rather rigid with only her side fins flapping and seems to be stuggling with moving she is eating tho.
She was fine before giving birth but now seems ill, the fry she had are very healthy and active and my other fish all seem fine.

All water levels are spot on as i take water sample to pets at home once a week as even tho i use my own test kit i had a problem with one kit it stated my ammonia was fine when in actual fact it was very high so i like to be safe than sorry.

Could this be body fungus or something else?

Hi, black mollies are quite hard to keep some fish keepers think. I have black mollies and i dont know if it is the same thing but both of mine got a sort of body fungus like a grey colour, i did a large water change and added some aquarium salts and it cleared in a couple of days.

They are brackish water fish so like to live in slightly salty water but unfortunetly this doesnt agree with all fish so may be an impossibility for you...i dont know as i am unsure which fish can be kept in salty water.

I didnt go by the instructions either with the salt i only added a little bit mind.

How long have you had your black mollies?

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Oh i forgot to mention that i think it could be her over secreating a coating thing....dont know exactly what it is but its common in black mollies...dont know if it slime coating....have you googled the symptoms and type of fish??

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I agree, many fishkeepers keep mollies successfully in freshwater but ideally they do need a bit of salt in the water if you want to get the best out of them.

I would consider taking a fresh sample of your water to a specialist aquatics store for testing, I don't mean to criticize but P@H can be somewhat unreliable. Do the grey patches look like cotton wool? Have you added anything to the tank in the past few days (i.e. medications)?