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Direct sunlight causes algae... You can get an algae eater to help out or you can just wipe it off... There is not much you can do about it . Unless you get the algae eater or you somehow prevent sunlight from entering your tank...
yea it's probably just algae/diatoms. My tank gets it often. There are a few things that can cause it.
Aside from direct sunlight your tank lights can too if you leave them on for while through the day. It's common in newish tanks and takes an adjusting period or if your nitrates are on the high side this can increase the growth of it I believe too. Your water may be higher in some mineral or something that may make the agae have an easier time growing as well.
Wiping it off is easiest though don't let it get built up too much on plants and decor. It can be a real pain when it gets on fake plants. I just cleaned the decor from my new used tank that had out of control algae and I seriously have to use my nails to scrape it off in spots because hot water and scrubbing with a tooth brush wasn't cutting it.
Diatoms feed off the silicates in the tank. Once they have eaten them all away, they will go away on their own. Because the tank is fairly new, they are still present in the tank.