It look like some sort of bacteria/alage white spots and if u look closer it seems like its moving or hanging off from the glass... i try scraping it off with alage spounge but keeps coming back a few day later. I read that its caused by overfeeding, too much lighting(which i dought because i dont have enough, its a standard 180gal w/ 47" lighting) can anyone tell me what it is? treatment? what should i do???