Sleeper Goby has a mouth sore...

[illapino83]

My sleeper goby has a mouth sore.. is there anything i can do or give to help it heal better? I cant tell him to ease up a bit on sand sifting cause i think it making it worse grinding his lower lip on the substrate lol

Here's a pick
https://drive.google.com/file/d/0B1YsTeDMMyA6ODY3ZHFoNnhfcVk/view?usp=drivesdk