Whats this in my sand on all 4 corners in the tank

[Ryanrttu]

Tanks been cycling for a week now, I just got back in town yesterday and noticed this pink/reddish color which is on all 4 corners....is it a flow thing or do I need more flow? Specs of my tank below

http://i.imgur.com/blLF9ax.jpg

[thegrun]

The start of cyanobacteria.

[Ryanrttu]

I take it I just let it do its thing then? Or do i need to do something? I thought that might be it but it was just weird only being on all 4 corners.

[thegrun]

It grows well in areas with low flow (like the corners of your tank).

[Ryanrttu]

Thanks...so maybe adjust flow which I have my MP40's about half way and maybe even move them on the glass some? Other than that just leave the sand alone huh.