Help

[tang lover]

I have a red head goby. And he looks all beat up. This all started about about three weeks ago. I was looking at my tank and I noticed the my red head goby had black on his face. And he always stood on the glass nevertouching the ground. And now today I looked at my goby and he was all beatin up. with white stuff on his lips. And he stoped eating. So I was wondering if you guys might know why this is happening.
His/her tank mates are:
2 red head gobies excluding him/her.
1 blue tang
1 red sea sailfin
1 yellow tang
2 zebra bar gobies
1 black percula
1 chromis
1 Fox Face
Help please.

 

[anthropo]

sounds like u have one too many gobies in there...they're probably beating the one up over territory.

 

[tang lover]

But my tank is 80 gallons.

 

[laddy]

....but there are more than 80g in there natural range.