Striped Blenny Rubbing Body on Sand

Hello Everyone! I have a quick question about my Striped/Fanged Blenny that I purchased 1 month ago from the LFS. I purchased 2, but 1 is rubbing her body on the sand, ornaments and dead coral. Other one is fine though. What is best course of action that I should do? Any help is greatly appreciated!


On a side not, the Blenny has been unusually lethargic of late. Before, it used to sleep inside little holes in the dead coral. Now, it just sleeps on the sand. I thought it was dead before, but then I nudge it with a stick and it swam away very fast.

 

Need info on your tank, water parameters, and maybe a picture.

 

Hi! The tank is 30 gallons, it is just him with another striped blenny and then 2 ocellaris clownfish that I have had for about 6 months. The clownfish have been doing very fine. I think I should also note that the blenny that is not sick has been eating food I have been feeding. Like shrimp and commercial food. But the sick one is not eating at all. In fact, never seen it eat personally since I've had it.

I will try to get a picture when I get back home. As for water parameters, I do not have a salinity, pH and ammonia tester. I haven't been able to do test in a while. Thanks!