Brown Algie

Hey and welcome..do you have any plants in?

What people usually call brown algae are actually diatoms. They are very common in new tanks, but almost always disappear when the tanks has been up and running for a while. A newly set up tank is a fairly chaotic system both chemically and biologically until it settles down and diatoms are among the opportunistic organisms that can take advantage of this and multiply extremely quickly, then die out as things settle down. I'd just leave them for now, you can't remove all of them and any left will only multiply again. When the plants are growing strongly and fish are in, they should disappear, that's my experience.

Thanks guys. That's one less thing to be stressed about. I'm hoping to add fish in a week or so depending on the cycle. doing a fishless cycle seems to have taken ages but if it saves fish it's worth it.