Brown algae isn't really algae, its diatoms. Very common in new tanks, will go away on its own eventually (several months usually, IME). Otos like them, yes, but they are fragile fish and after the diatoms are gone, you have to supplement their food. I just manually clean until they go away.
Most of the fish you have are schooling fish and should be in groups of about 6. You have room in that tank for several more. I'd definitely get 4 more harlequin rasboras and 4 more cories. I wouldn't get more than that though.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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