what is this on glass

[salt125newbee]

can anyone tell me whats going on here, 125g with t-5 lighting, tank has been up and running for a good 6 mths, in the past couple weeks this brownish stuff is all over the glass, i use a scrapper and knock it off and its back within two days, is it harmful or just a pain in the ***, thanks for any advise

 

[Mmsetta]

What kind of clean up crew do you have. Looks like normal algae growth or diatoms to me. Turbos or astrea's should take care of that.

 

[Oscaror]

Just scrub it off. Everybody does it, it's always back in two days. It's just a thing you need to deal with, I know it sucks, a magnetic algae scrubber will make things easier.

 

[tinyreef]

Definitely just normal algae! Clean up crew really helps keep things in check. I have a sand sifting goby (diamond goby) to keep the sand clean and a bunch of different snails and hermit crabs to help with algae. Just tell your LFS you need a clean up crew and how big your tank is and they can recommend some.