Brown Algae/"Diatom" on my tank wall

[Ralph]

<img src="http://www.aquaticquotient.com/forum/attachment.php?attachmentid=48467&amp;stc=1" attachmentid="48467" alt="" id="vbattach_48467" class="previewthumb"><img src="http://www.aquaticquotient.com/forum/attachment.php?attachmentid=48468&amp;stc=1" attachmentid="48468" alt="" id="vbattach_48468" class="previewthumb"><img src="http://www.aquaticquotient.com/forum/attachment.php?attachmentid=48469&amp;stc=1" attachmentid="48469" alt="" id="vbattach_48469" class="previewthumb"><br><br>I notice this a week ago, brown stains on the inside of my tank. At first I thought it might be that I accidentally moved my rocks against them and cause some mud to stick on it (although I cannot remember shifting my lava rocks), so without a cleaner, I took a folded tissue and used my pincer to wipe it off from the inside. It comes off easily.<br><br>however, this week I notice more of it on the wall, about 4-5 patches this time. So I am convinced that this is something brewing.<br><br>does anyone know what is this?

My tank is about 2 months old and cycled after the 5-6th week. This might be an algae issue. I know marine tanks have "diatom" during, but for freshwater tank too?!

[Ralph]

Pics posted again as noted above did not load well.

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