Dereks, what type of lighting do you have over this tank? Like said above, something was out of balance to cause this. Lights on too long, available nutrients in the water, etc..etc.. Just have to figure out what changed if this just popped up all of a sudden. I think you answered your own question though with the lack of water changes. Like Sheila said, adding more bio load to the tank won't be a cure. You have to adjust your maintenance to deal with the added bio load anyway.