Hi, I'm a newbie turtle owner. About two weeks ago I bought two baby yellow slider turtles from chinatown in CH. We have the terrapin food pellets and change the water every two days in a large hermit crab tank (no hermit crab in there). We feed them twice a day (morning and night) with about 3-5 pellets. I have a UVA lamp that I bought from petsmart and was wondering is there a UVB lamp? because we couldnt find one. I let them bask on a platform and rock about 1-2 hours every day twice. We've kept the water level low like the guy had them when we first bought them. Planning on moving them into a bigger tank soon ( proobably in the next month). They have both grown in size and are very active. I sometimes fill the tank with more water to let them dive and swim, which they are good at. But just today after I changed the tank water i noticed that the smaller one (my sister's) had some white stuff on its neck and back hind legs...they had air bubbles so I thought it was just the air bubbles in the water, but a good 30 minutes has passed and its still remained clinging onto the turtle. Mine doesnt have anything on it...so I'm clueless as to what it is...
I've read up on all the diseases and treatments, but I just want to make sure it's not shedding or anything. The turtle eats fine, about one pellet lesser than the other one, but swims fine, and is more active (its also more frantic and cautious). Could it be that its not getting the right nutrition? SHould I start it on lettuce? Or is it not getting enough vitamins and UVB ?
Please help me out, thanks!

