I found white spots starting to develop on the black silicon of my tank. I've only noticed it going up the corners of the tank wall. I scrub them off with my finger every water change [100% 2x a week (2.5 gal tank)]. They have only started appearing recently and I haven't changed any of the chems used for the water treatment. They have yet to appear anywhere else and have not affected my fish in anyway so far. The spots have been appearing the past couple weeks. Anyone know what it may be and how to get rid of it?