Lepisosteus platyrhincus;3132602; said:latex paint, i think it is. comes off in huge pieces if you want to take it off.
I have several tanks with the backs, bottoms and some with sides painted with standard latex house paint. It peels off very easily when I want it to... I've never had problems with it getting wet... I've never had a tank that I painted peel off expect when I wanted it to... although I do have some used tanks with paint peeling off although I do not know what kind of paint the original owner used...
Besides, if every 5~10 years you need to repaint the tank... chances are every 5~10 years you could use a full remodel of the tank... I have tanks that I painted with latex house paint that have lasted 5+ years...
Ive also used spray paint, which is far messier to use and far harder to scrape off Ill never make that mistake again
Something else to keep in mind... any paint you use (flat, semi-gloss or high gloss) will appear high gloss when used on the back of a tank. Since the viewing surface will be seen through the glass... it will be perfectly smooth and the glass itself causes the high gloss sheen.