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Nope. They have a sort of beak like other tooth-less fish. Well, I've never seen teeth in my BGK's mouth!

Defrost the cube before you place it in the tank and make sure it spreads all over - your BGK will find worms the other fish miss.

What other fish are in your tank? Can you move all your rocks/plants/decorations so there is only one hiding place which you can see into? Have you any smaller fish that you have noticed are disappearing (BGK hunt at night)?

I think you will find that your "he" is actually a she! From the angle of the photo it is difficult to tell, but I believe your BGK is a female. It has a shorter and blunter head shape and the slope from the top of the head to the tip of the nose is steep. Males heads are longer from the top...

Hi all, First post on these forums. I am glad you guys have a dedicated knife fish section! I came here because I was looking for information on BGK fry. I have two BGK which I bought from a friend of a friend recently (very cheaply) and have kept for the last 3-4 months in a 5x2x2 foot tank...