Help Diagnosing Fire Goby

[guitarfish]

My fire goby has some rips in his tail fins, just noticed this out of the blue. There aren't any pieces missing, it doesn't look like someone bit him. I haven't seen anyone harassing him either. There are about 4 "slices" in it.

I immediately checked water quality:
ammo - 0
trites - 0
pH - 8.2
calc - 400-450 (not a good test kit)
SG - 1.022
alk - med to high (not a good test kit)
trates - 10

I feed a combination of formula 1 & 2 and mysis shrimp.

Any ideas?

[ReefGeekster]

Could be any of the fish you have that may have nipped at the little booger or even a crab.
Keep a eye on the fish, also make sure the tank is covered, if he is threaten he may jump from the tank.

[wylie713]

sorry i cant help with diagnosis but as a side note, i would bump the sallinity up to about 1.025-6 :)

[Steven Pro]

This sounds more like physical damage than disease to me.