Lights off by mistake for the day. Strange Black Hair Algea

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EL Diablo

Aquarium Advice Freak
Joined
Jul 20, 2004
Messages
320
Location
USA
Hi guys

I forgot to turn my lights on today. Last night I turned the lights off with the switch and forgot to turn them back on in the morning, so the timers didnt matter.

As soon as I got home I turned the lights on.
Figure the tank will get almost a half day of light

I just noticed for the first time thin strands of Black hair algea on a few locations on my sand.

Also my clove poylps were closed and I noticed this fine Black hair like algea on some of the closed Polyps.

Since the lights have come on the Polyps have opened.

Everything looks ok.
any ideas about This Black Hair algea?
 
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