subliminalanarchy said:I was under the impression diatoms are more... uhm.... 'dusty'. I don't think they would stick to the glass like that. I think I've seen this stuff before though (I wipe algae at my work for like an hour a day lol). But if it is diatoms it will go away on it's own.
BigJim said:Diatoms aren't algae, but they're often called brown algae.
The white spots could be the start of green spot algae. I get it on my high-light planted tank and it makes the tank look hazy. The spots could also just be water spots on the outside of the glass. A razor blade will take care of the former and wiping the glass with some white vinegar will take care of the latter.