I thought H. sp. 2 looked closest as well. $5 where I bought him.
A damn shame. He died early this morning. I felt terrible for the little guy. His stomach was grotesquely sunken in. He'd flop about when he tried to move and land in whatever position he happened to be in. A gorgeous fish, just wish I had found him, and the rest of his tankmates, a whole lot sooner.
When I bought him I asked to buy however many were left in the tank and the guy said he thought he had two or three besides the one I'd seen. When he moved the decor over all kinds of bones, spines and scales came swooshing out, "oops, no, I guess it's just the one"

. Absolute pity.
Thanks sid. Will come in real handy should I come across them again.