Brown Stuff appearing on Substrate

[KlassicKrab]

My tank is 6 months and I have mainly just fish and inverts in the tank. If you want to know everything I have just say so but for now I want to ask about this brown algae like stuff that appears on my substrate.

I've have green hair alglae that grows in small clumps. Its not hard to get rid of and I cant siphon it out quiet easily. But more often than I like, there is a brown golden color algae/bacteria appears on substrate. I can siphon it out but it usually comes back stronger and darker. I use to do a 10% percent water change every two weeks but now I do a 5% water change once a week. These water changes aren't helping the algae problem.

Are there certain critters I can buy that eats this stuff? Sorry I dont have a pic.

 

[rafa316]

Does your stuff looks like this?

 

[rafa316]

Ah, also it might be a diatom algee bloom, for what I know it is common and the end of the tanks cycle
see here for more:

http://www.nanoreef.co.uk/index.php/attack-of-the-diatom-algae

 

[KlassicKrab]

It kinda looks like that but its on the sand. I guess whatever may have gotten on the rocks was eaten by the snails. When my tank was new i had diatoms, this is slightly different. Diatoms was easily siphoned out using a hose, but with this brown stuff I have to use a narrow hose which also sucks in some of the substrate as well.

 

[drummereef]

Do you use RO/DI water? If so, do you know what the tds is?