at the very least, u should send that photo to julian at planetcatfish.. it's a very rare sight.. would be cool if u could breed these guys!Lol! The grunting does occur at night..........Usually I write off the grunting as territorial disputes as they do share the same fake log, more of a stay on your side thing. I will say though I never even gave thought to breeding them, perhaps it's something I should look into; though it would've been better to try when I still had 4 of them. Guess I'll start doing a little research to see what I can find on Driftwood cat breeding. Thanks for the inspiration!