Hey guys ive got yet another question. I recently aquired another 55 gallon tank with stand from a friend who was moving. It was a freshwater steup but i am going to set it up into a saltwater display tank. The problem is that it has no water in it and hasnt had water in it but some algea remained. The algea now looks like a white film on the glass and i cant scrub it off. Ive tried useing a toothbrush and that didnt work. Any ideas on how to make this tank crystal clear again?