My Knife Fishes & Aba Aba .

  • We are currently upgrading MFK. thanks! -neo
seems a little small for all of those fish though
 
I plan to keep my Aba Aba the same way. I have been having a problem getting the small ones to live and can't seem to find a bigger one in my area. I have some included some stats on my tank and advice would be greatly appreciated:

My Nitrate level is at 200 ppm (Extremely High), my Nitrite level is 0, My Hardness is 250 ppm, The alkalinity is somewhere between 0-80 ppm (Low End) and the PH is 6.8 - 7.2 in range. What do you think is killing them?
 
MonsterFishKeepers.com