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Sounds like it's brown algae, or another name for it, diatoms. It usually appears in newly established tanks. I'm currently going through the same thing. It's supposed to go away in a month or so, so it's really not a big deal, the main thing is it looks bad. The thing I'm not sure about is if it will mess with your plants, which I'm assuming are live(?) If so, maybe you need more of them to out compete the algae... Also, snails don't usually tend to eat the brown algae, they prefer the green over the brown (my snail doesn't touch the brown algae in my tank). You can use something like a toothbrush to scrub off the algae on your decorations and tank to help keep it controlled. It's a bit of work, but it helps control the algae and if it is brown algae, it should go away in time...
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