I've attempted many times to try and figure out his/her species name, but I've failed misserably. It seems that the pet store I purchased him at is the only one that calls them "h-line" cats, and I haven't ever seen them anywhere else. My dad, who lives in Tx, knew what fish I was talking about when I mentioned it to him, but everyone else always asks what it looks like. I don't know what kind of water conditions it really favors, but it seems to flurish in my tank.... although cats are generally pretty adaptable to most conditions. I keep the temp between 76 and 78, and I used 1 Tbsp of aquarium salt for every 5 gallons of water to keep my gar, and eels happy. Honestly that cat has been the most healthy, harty fish in the tank since we started it.