Do you think they would be safe with the bitaeniata?Yea i have them in or near blackwater conditions; i haven't tested the ec recently but it is somewhere between 20 and 40; it seems a few leaves can raise the ec a bit. I use ec 3 to 10 water (at the start of the month i replace the sentiment filter and some of the di risen and by the end of hte month is rises).
It is just easier since my base tap is too hard for a lot of the wc dwarf cichild to breed. I'm not sure this species of tetra require blackwater but i only have 3 tap aquariums and the 10 is too small and the others have fishes that could eat them. The elizabeth they are with are youngish and have smaller mouths then some of the other apisto such as winkelfleck and ipiranga.