ok, i have no filtration in my betta tank, other than a 'filter pouch' thing that claims to help with reducing toxins and algae. i figured it couldn't hurt. anyways, the tank is about 3.5 gallons, with heater, gravel, 2 plants and 2 fake bogwood things. my betta (ice-man) seems to be perfectly happy, patrolling the borders, blowing bubble nests and eating anything i throw at him. the only problem is this darn algae. it's like a slimy coat that forms on everything in the tank. i've tried adding king british algae remover, which is supposed to supress algae, but it doesn't help. i wipe out the tank, and siphon off as much as i can, but i'd rather know what was causing it, to be honest! the tank's lit with a lamp for most of the day - could it be too much light that is the problem? any help gratefully received...