I no longer have any corals but this blue/black looking "slime" has started to show up on my live rock. There's more underneath the rock but this is the best picture I could get. Is this a sponge? Should I worry?
Most recent parameters:
Salinity - 1.024
Nitrite - 0
Nitrate - 5.0 ppm
Ammonia - 0.0 ppm
PH - 8.0
Phosphate - 0.25 ppm
Calcium - 240 ppm
KH - 179 ppm
Most recent parameters:
Salinity - 1.024
Nitrite - 0
Nitrate - 5.0 ppm
Ammonia - 0.0 ppm
PH - 8.0
Phosphate - 0.25 ppm
Calcium - 240 ppm
KH - 179 ppm