Brown Algae & Filtration

[Coralocean]

My 10 gallon has one male Betta and a Ramshorn snail. Since Betta's do not like fast moving currents I put a filter sponge in a place that slows the outflow of the HOB. I set that tank up close to the same time as my main tank which has lots of water flow. The betta tank had a brown algae outbreak and my main tank did not. Is the lack of flow/oxygen causing the problem? I was able to clean a lot of it out so it's not a huge problem yet.
Thanks

 

[Delapool]

Just thinking the flow might discourage the algae but would be checking light first as well.

 

[ZxC]

If they are diatoms a single oto cat would have it cleared up in ... 48 hours??? 1 oto in a 10 gal with a betta is perfectly fine.

 

[Coralocean]

If they are diatoms a single oto cat would have it cleared up in ... 48 hours??? 1 oto in a 10 gal with a betta is perfectly fine.

A new fish? Twist my arm a little harder LOL.

Since I made this post I completely rescaped that tank. I removed the gravel replaced it with black sand and added quite a few plants. I really love it and so does the big Guppy. No sign of brown algae...yet.

Thank you