The glass of my 75 continuouslly browns over. I usually have to scrape the glass with a razor or algae cleaner once every two days, and if i wait 3 or 4 it gets to the point where its hard to see through the tank. Based on other people's pics, this seems to only be my problem. Tank is 48" long and 18(?)" deep with a orbit PC 6x54 watt 2 actinic 2 50/50. There are also little pink colonies of bacteria on the sides and the back of the tank, which i usually dont clean. It looks like someone stuck their gum to the sides of the tank. Is this usual?