Spotted Headstander Fish

Spotted Headstander Fish are unique and fascinating fish due to their way of swimming with their head down, drifting around the tank, with occasional bursts of speed. I have sadly not had the best of luck in keeping them. I bought two from my LFS several years ago. Almost immediately after getting home, one started to terrorize the other. The victim was chased around until it found a spot to hide behind the heater, where it died after about a week of not being allowed out to eat. The stronger of the two showed absolutely no aggression towards the various tetras and cherry barbs that I had. Suddenly after 6 months and no signs whatsoever, the headstander died. I was able a few months later to find a single specimen and it also led a peaceful life with the tetras and barbs, until it too died suddenly after 6 months. I only wish I knew what could have been done to make them live longer as I have not seen any at my LFS for a few years now