

I was watching him swim around a couple of nights ago, and noticed that he had quite a large build up of algae on the back of his shell, and also down in the rocks at the bottom of his tank. Using a soft bristle tooth brush and some warm tap water, I gently scrubbed most of the algae off of him, but was wondering if it was a cause for concern ? I clean his tank regularly (Usually every couple of weeks, and add water and chemicals about once a week), but this last time I cleaned it I noticed that this algae formed after. It cleaned right off, and it appears the filter cleaned the rest of it out of the tank, but I was wondering if it was something I needed to worry about. From the books I do have, and the pet stores that I have talked to, it appears that he is in normal health with everything else, as far as his color, his shell, and his diet, was just a little shocked when I seen after 2 years one day he had algae on his shell.
Also, I am pretty sure that the 30 gallon has stunted his growth any more, as since he's moved to the 30 gallon a little over a year ago, he doesn't appear to be growing very much anymore, aside from his skin shedding. I thought it was kind of weird since in the 30 gallon he looks small compared to the amount of space in the tank, but from what I read I guess you need 10 gallons for every inch of turtle? He's definately more than 3 inches long, as you can see from the pictures. He's almost the size of my hand from tail to head fully extended, both length and width. What would you guys suggest for a turtle his size ? I was going to start out with a 50 gallon and see how far that went, but I don't want to go over board and get one that's too big for him, and risk him growing TOO fast and having shell/health problems. I'm not sure what the average fully grown size of these things are, but i've seen and heard some of them getting to be quite big.

