This spot appeared today on my tang, what is it, I don't think it is ich, but I could be wrong. the tang is acting a little strange, I mean for the most part he does his thing eating algae and everything else he finds floating in the water, but occasionally it looks like he's fighting the glass maybe just 5 minutes out of the hour.
water parameters are:
SG 1.026
ammonia 0
Nitrites 0
nitrates 10
phosphates 0
PH 8.1
water parameters are:
SG 1.026
ammonia 0
Nitrites 0
nitrates 10
phosphates 0
PH 8.1
alkalinity 10° dKH
calcium 460
Mg 1260
Temp 79°
any help would be nice
Mg 1260
Temp 79°
any help would be nice


