My platy - the one who was not under the weather has long stringy white stuff trailing from him. Is it poop or worms? Is it normal?
If worms how do I treat it? I remember it had that when i first got it but have never seen it again until now.

it's normal its just poop my guppies and platys do it too

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A dog comes when you called - a cat takes a message and gets back to you.

Thank you.

Not so hasty. White, stringy faeces are NOT NORMAL. The faeces of a healthy fish should be a brownish-red colour.

If the faeces are like this constantly, I would suspect internal parasites or parasitic nematodes.

Should I medicate the fish if you think it is worms. What would I use so that it does not affect the PH in the water or harm the filter process?