Tank is 3 months old, have this long flat rock about 12 inches below water line. It has a nice layer of green algae and some pink coraline spots appearing, but the very dark spots( black?) are new and I do not know what they are, or if good or bad.
Can anyone one offer advice on the dark spots?
tank parameters:
Ammonia, nitrites, and phosphates =0
Nitrates= 10
PH = 8.0
Salinity = 1.025
Calcium = 440
Can anyone one offer advice on the dark spots?
tank parameters:
Ammonia, nitrites, and phosphates =0
Nitrates= 10
PH = 8.0
Salinity = 1.025
Calcium = 440