I looked at your profile, marcusrose123. That thing that you're calling a snakehead looks more like a bichir to me.

If your fish are living in a tank that size, then they are stunted and that is not something to be proud of let me assure you.

Some of the fish you have get huge and require a huge tank that is a fact. You are not doing them any favours by keeping them in a tank that is definately too small for thier potential adult size.

The fact that you have had the snakeheads for 6years and they have not reached their full otential prioves they are not kept in the best conditions

Not what you want to hear i'm sure, but the truth never the less

well i could argue different since my snakeheads where breading today!
nd i dont think this is true at all

I did some more research and found it is a snakehead not a bichir. And I would say they are full grown and if you want to add more fish I would get a bigger tank. This tank is not big enough for what you have, I would get like a 200 gallon tank and then add some more but whatever you get needs to be 8+ inches big. As far as the black ghost knife they get to big for this tank and that will slow their growth and never make it to their full size and will probably die earlyer then living their full life span. Here is the profile I found about your snakehead
http://www.seriouslyfish.com/profile.ph ... chua&id=49