Algae question.

[LEOreefer]

Hello all,

I am a experienced reefer that recently suffered a tank crash. I restarted my system fresh with new dry rock and marine pure bio block. I went through the stages of cycling never got diatoms but got some sort of brownish green Matt algae.

My question my rock now appears to have a black look to it. I do weekly water changes and have 2 mp10s which create strong flow. The tank is bare bottom and when I blow the rock off I get some junk off but the blackish look stays. Anyone have any idea what this is? I don’t seem to remember having this problem on past tanks.

 

[Idoc]

Is it just looking black on the rocks with the blue lights on? Or also with the white lights?

 

[Hemmdog]

Do you have a clean up crew?

 

[Bbfishb81]

Is it a sponge maybe? If its black sponge, try not to touch it too much. Leaves a nasty sting.

 

[LEOreefer]

Is it just looking black on the rocks with the blue lights on? Or also with the white lights?

The blue light definitely make it look worse under daylight light it looks like a dark brownish black like a turf type of algae

 

[LEOreefer]

Is it a sponge maybe? If its black sponge, try not to touch it too much. Leaves a nasty sting.

Definitely not a sponge, it’s definitely some sort of algae

 

[Idoc]

The blue light definitely make it look worse under daylight light it looks like a dark brownish black like a turf type of algae

I have a really dark green turf-like algae that has popped up in a few places...finally found a snail that is working through it...a Mexican Turbo. Maybe attempt to beef up the CUC and see if it helps. If it is blowing off the rocks with a turkey baster, then we are talking something else other than algae probably.