[flamingo]

Don't plan on breeding knifefish, ever.
It's been done, mainly in clown knives, where a random pair will lay eggs.
Mostly, they're unfertile, and never even make it past the first day.

Ghost knives have a long way to go, before they even have a clue on their breeding habits. In reality, they know almost nothing about them in the wild, and they've only been filmed on a handful of occasions. In captivity, it's somewhat difficult to even keep larger ghost together as tankmates..

I won't comment on your stocking, seeing as jer already had a go at it.