Questions about Brown Ghost knives

[Friller2009]

Hi all, Recently I was browsing a fish website and noticed they had some "Golden Ghost Knife fish" in stock, at first I thought it was a morph of a BGK, but the scientific name is that of a Brown Ghost Knife, Apteronotus leptorhynchus
So I have a few questions:
What is their max size?
What is their temperament?
Is a 110g (4x2x2ft) big enough?
Will it fight with my Black Tandan and Crimson Spotted Rainbowfish?
Thanks,

Golden Ghost Knife Fish 6cm

The Golden or Brown Knife Fish is a close relative of the beloved black ghost knife. These weird fish intrigue a lot of aquarists because of their unique body shape, colouration, and almost drunken swimming style. These fish reach around 30 cm which makes them a fantastic addition to larger...

livefish.com.au

 

[Fishman Dave]

You really need a photo to confirm exactly what they are, but there have been gold varieties of the fish you mention listed before elsewhere so it is possible that name is correct.
max size is just shy of 12” although I think this is probably on the high side.
a social knife so one of the ones that benefit from being in a group and they have been bred before.
with enough hideouts it shouldn’t bother your tandan. And I would expect your rainbow fish to get too large to be bothered too but no guarantees there. Not kept this species personally so can’t advise on its temperament.

 

[Friller2009]

You really need a photo to confirm exactly what they are, but there have been gold varieties of the fish you mention listed before elsewhere so it is possible that name is correct.
max size is just shy of 12” although I think this is probably on the high side.
a social knife so one of the ones that benefit from being in a group and they have been bred before.
with enough hideouts it shouldn’t bother your tandan. And I would expect your rainbow fish to get too large to be bothered too but no guarantees there. Not kept this species personally so can’t advise on its temperament.

Ok thanks! My concerns was that the knifefish would want to pick on the Catfish because of the similar body shape