Can someone tell me my why this is happening?

[MightyO]

Can someone tell my what this is a how to get rid of it

 

[Spencer1044]

It could be brown algae which usually occurs in the gravel i use to get it on every thing all i did was rub it off. If it is brown algae get some live plants which will compete for light and carbon dioxide in the the tank and it will eventually go away.

 

[MightyO]

?????that's exactly what it is thanks

 

[Spencer1044]

No problem

 

[Ben the Betta]

I'm having the same problem too with brown algae, now I know how to get rid of it, thanks!