my new algae

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Sealab2021

Puffer
Joined
Nov 4, 2003
Messages
142
Location
Tukwila, WA
so over the last 2 weeks a lite purplish-gray tint has showed up on my sand in some places? any clue what it is? it's on my FO 29g w/NOflo lightin tank that's been up 2+ years. my ph is a little low (8.0)

it's not the diatom alage that's tan/brown, it's a light purplish-gray color w/no brown tint at all
 
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