ID on this red algae?

[paul.o]

Not sure what this is, it's quite thick but scrapes of the rock easily, only to return eventually, it's only on this rock and no where else in the tank. I am aware I have an algae issue and am dosing fluconazole to eradicate it.

 

[RV Reefs]

Could be coraline? Does it flake off if you touch it with something?

 

[paul.o]

Could be coraline? Does it flake off if you touch it with something?

I wouldn't say flakes off as it's quite soft and just gently rubbing it more or less brushes off the rock, coraline would be quite hard I would have thought.

 

[Reeferbadness]

Def doesn't look like coraline algae. I would just call this butt ugly brown algae. Try siphoning off what you can. You can also try taking a tooth brush with some hydrogen peroxide on the brush and scrubbing the rocks. This won't solve the problem of what caused the algae but should get some off.

 

[krollins]

Looks like red slime/cyano

 

[Idoc]

Looks like red cyano, especiallly if it comes off the rock really easily with brushing or blowing it off with a turkey baster.

 

[paul.o]

Looks like red cyano, especiallly if it comes off the rock really easily with brushing or blowing it off with a turkey baster.

Yes I agree possibly cyano, it did brush off easily, I have also brushed off the other algae and the tank is looking a lot better, just hope it doesn't return.

 

[chip shop]

I’d take a sample to your lfs if they have a magnifier and determine what species of cyno it is so you’ll know better how to eradicate it

 

[paul.o]

It could be that there is not enough flow in the tank, I am only using the return pump at the minute, It's a red sea max nano so I was trying to get away without using a powerhead.

 

[chip shop]

More flow will definitely help but see how quick it comes back

 

[chip shop]

Carbon dosing is also a good way to outcompete it