Cyano?

[Ethirtysix]

Diatoms cleared up and then this popped up
On 2 rocks sorry for bad picture need to clean glass

 

[shermoen]

Kinda hard to tell from the picture but it does look like cyano to me. Is it red? If so get some chemiclean and it will clear it up.

 

[Ethirtysix]

It’s more of a brown slight bit of red slimy with some bubbles under it. Thanks for the reply

 

[shermoen]

Yeah I would say its cyano with those bubbles. When I dose chemiclean I do as per the instructions. They say to do 20% water change after 48 hours I believe, but if cyano is not cleared up I will dose again and the do the water change 48 hours after that. Works everytime.