I have decided the gymnotus knife deserves its own tank, i got a 120x44x60cm tank for cheap.
The hujeta's were almost done messing with the knife but as soon as it started to come out more the biggest hujeta's interest in its tail came back.
So ive added some extra cover in the form of twigs, wood and leafs so it has its own little area to hang out in, as soon as the tank is ready and has same water parameters i will add him to the other tank.
I want the fish to feel safe and right now its not in immediate danger but will get hassled every once in a while.
Im thinking of moving the bleeding heart tetra's with the knife aswell and might look into getting some type of wood catfish to add with the hujeta gars, one thing at a time tho im busy enough with these fish as is at the moment.
Maybe some day the knife is big enough to be placed back with the hujeta's, but for now i rather enjoy them seperately