I have painted two of tanks both with the same shade of blue on the back and sides and one of them with a white bottom. Both painted in gloss and both look stunning. Just make sure you get one coat gloss but give it 2 coats. When i painted mine with the first coat and put the painted side towards a window and looked from the inside out, i could see where the paint was a little thin, so i gave them a 2nd coat and it looks brill.
Hope that helps in someway.