I agree with Mikaila. Interesting that i just finished a post in your other thread, and I warned you there about this so-called algae eater
. Won't repeat all that, but briefly get rid of them, they can be nasty and they get big and don't eat algae once they do.
Diatoms (brown algae) is common in new tanks, it will dissipate as M said. I personally do not favour getting any fish to handle algae, unless it is a fish that you really like and want on its own merits. Algae in planted tanks is not, or should not be, a problem. Once established, a trio of otos are nice, or a Farlowella, or a small species pleco like a Bristlenose.
I referred you to the profile on the CAE in the other thread, our profiles are under the second tab from the left in the blue bar across the top. If the name is the same in posts as it appears in the profile, common or scientific, it will be shaded and you can click on that for the profile. Check out the Oto Catfish, Bristlenose Pleco, Farlowella vittata. But these need some space and impact on the tank's bio load so unless the fish is wanted, I would not. From the other photos I am assuming this is a 10g or 20g tank and these fish will add a weight.