Curious Wormfish (Gunnelichthys curiosus)
 

Does anyone on here have experience with these fish? I picked one up last week at an out of town LFS. It didn't go into immediate hiding, and was out in the middle of the night while I was feeding my sun coral. It disappeared after that, so I worried it had jumped out or died. I just managed to find it.... in the basement fuge.

I'm trying to figure out if I should just leave it down there where it can continue to feel safe, or put it back into the main tank where it'll most likely hide forever more.

if it found itself down to the sump, it'll do it again. I say put together a tank and connect it to the sump with a few pvc and a drain that won't allow it to slip through.