hey

We bought three male platys about two weeks ago. Two of them are fine, swimming around, very active and eating. A few days ago we noticed a few white spots on one of them as well as one of our cardinal tetras, so we thought they must have ick. We turned up the water temerature to 82 degrees F and have bene giving medication (protozine - i'm not sure what it is exactly, my mum got it) We plan to leave the water temperature up for at least two weeks. anyway, the platy who we noticed had the ick seems very shy and its stomach is
very big and round , and for the last few days it has been hiding inside a fake log or at the bottom of the tank behind some plants. It has also stopped eating. I am very worried that it could have dropsy, however its scales are not sticking out.
Our aquarium is about two months old and it is 22 gallons - it is our first one ever.
We check the water every day and it is fine - Ammonia is zero, nitrates and nitrites are also fine.
We have been doing about 15 percent water changes every day since we discovered the ick.
The fish in our tank are: 3 zebra Danios, 6 Cardianl tetras, 3 platies.
I would really appreciate if someone could help, so I can help our platy.