I'm planning on converting my only tank (10g) to sand for my corydoras. It's currently running an UGF and I've already seen their barbels disappearing, although I was planning on switching to sand anyway. I think it will look a lot nicer (no matter what sand I end up with: black, natural or white ...

1. Water parameters a) Temerature: 77 degrees b) pH: 7.4 c) GH d) KH don't know exact GH/KH, but LFS told me it was very low. e)Ammonia, Nitrate, Nitrite, leavels. zero as far as I know. f) Water change frequency Weekly or more (if it looks like it needs it). 2. Tank set up a) Size. 10g w/ tank ...

Wow. Now that I look closely the difference is very clear. Thanks.

I found some adorable corys at the lfs labeled "skunk corys".

I've located 2 fish from this site that look like them:
corydoras arcuatus
Corydoras narcissus

What is the difference between these two fish? How do I tell which I have?