Advice on a Black Molly please

[Skyedriver]

We've had this black molly for around a month and she's been a bit of a character.
First she popped 3 babies (two survive), then she looked seriously diseased - until we realised it wasa bit of fish flake stuck to here head that took a couple of days to budge.
But now, I think more seriously, one of her eyes has gone cloudy, the othe looks fine. The very edges of her lips also seem to have a silvery tinge but not sure if that's new or not.
She otherwise seems fine, feeding, swimming with the others etc.
Any advice?

[Dr Mike Oxgreen]

Probably a bacterial infection. Treat with an antibacterial medication from your local aquatic shop, which you'll add to the water.

I would do a 50% water change first, and again in a week's time, in case there's any problem with water quality.

The other thing you could try is a salt dip. Take some of the water out of your tank into a bucket, and dissolve about a tablespoon of sea salt per gallon into it. Net the fish and place it in the salt bath for a few minutes, or until the fish shows signs of distress. But live bearers like mollies are highly tolerant of salt, so it shouldn't stress it. Then put it back in the tank.

In fact, if there are no other fish species in the tank, you could make your water brackish - mollies do well in slightly salty water. I think about 0.1% by weight - so about a gramme per litre - is probably right, but ask at your aquatic shop and they'll tell you more reliably.

[Turn7]

If you do use any meds, make sure you remove any Charcoal from the filtration system - it will absorb the meds.

[Skyedriver]

Water quality is good and I do a 40% water change every week, don't like adding chemicals although I have occasionally.
Tank has 2 guppies, one swordtail, two mollies and two 3 week old mollies.