The cichlid (green terror) might pick on the ghost knife.
Green terrors, like most cichlids should be kept with fish of the same temperment and also fish that can fed for themselves.
In my opinion I don't think the two would make a good match.
black ghost knife fish gets nutrients and energy from the food it eat
No.
The maximum length of the black ghost knifefish is 40 centimetres
they can be 49cm.
No.
Yes it can
Black Ghost Knife Fish are semi-agressive. They should be fine though. The angelfish should be fine.
Yes if its the only one?
fish about 5in or 4in lowest
Depends what store!
Several years. It is more reliable to say that Black Ghost Knives are mature at 15-18 cm (6-7 inches) long.
Black moors are a variety of goldfish which are egg layers so they can't get pregnant.