i have algae growing out of my filter... this is prety gross and i have no idea where its coming from. i know that i have to change the filter, but what could be causing the growth. the tank is in a room where the stove is and the water has been evaporating a bit quicker than normal, but i have the heater in it and the temp has been prety constant. any input would be appreciated, id like to get rid of it... thinking about a snail... thanks guys!!