I have a white molly that looks bloated and seems to be having difficulty swimming up to the top of the tank. He/She does also not to be using his/her tailfin to swim. I dont like to see the fish in distress and wondered if anyone had any ideas!!
No idea about the perameters although I did get the water tested in a shop just after the tank was set up. They told me the water was a little nitrate heavy although this was a couple of months ago now. I changed some of the water and all seems well since then with the other fish. I have other mollies and they are ok. The tank has been set up three months now. ThanksWhat are you water perameters (ph, ammonia, nitire etc), and which kind of molly is it? How long have you had the molly? and how long have you had the tank set up?
No idea about the perameters although I did get the water tested in a shop just after the tank was set up. They told me the water was a little nitrate heavy although this was a couple of months ago now. I changed some of the water and all seems well since then with the other fish. I have other mollies and they are ok. The tank has been set up three months now. ThanksWhat are you water perameters (ph, ammonia, nitire etc), and which kind of molly is it? How long have you had the molly? and how long have you had the tank set up?

First, hello and welcome to the forum.
I will move this to the Emergency section for you.
I would agree that investing in a liquid master test kit would be a good idea. It's important to know what the ammonia, nitrite, nitrate and pH are in a new tank. When you had the water tested before adding fish, it would naturally be ok since it is basically straight from the tap. There was no ammonia source to create problems. Once the fish were added, you start to get ammonia and later nitrite both of which are toxic. In the mean time, keep up a good water change schedule of about 25% at least once a week.
Back to the original topic, if you don't know the parameters and all the other fish seem ok, then I would say it sounds like possibly swim bladder or constipation although the bloating could be a sign of other problems. There is no cure for swim bladder but constpation can be cured by feeding cooked peas with the hull/skin removed. You can do enough for the whole tank as they will all eat them. Since he is having problems swimming, you wil probably have to isolate him to get him to eat.