Cyano on a rock

[RyvBoy]

I got good values of the water.. but from a rock where died a coral started a ciano colony.

I could temporarily take that rock out of the water.. but what do you suggest? I already tried just to wash it over but it came back

 

[hegeh]

Nutrient imbalance.. what is no3 and po4 reading?

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[bertoni]

How long ago did the coral die? If it's only been a short time, I would just let the system adapt to the change.

 

[RyvBoy]

nutrients are ok.

The coral was dying 2months ago more or less... (falled in an Euphyllia). actually didn't die, at the moment it is in another tank to cure.

I could take the rock out of the water but just washing it I guess it won't work

 

[RyvBoy]

 

[bertoni]

Washing it won't do much, most likely, but you could siphon off the cyan once a week or so, to remove nutrients. In all honest, I'd just wait, but there are chemical alternatives. Just running a bit of carbon dosing might help outcompete the cyanobacteria for nutrients. That doesn't always work.

 

[RyvBoy]

0,04 Po4
2,5 NO3

 

[bertoni]

Those levels are not all that high.