Personally I would go with 2 spotted just to ensure an ample amount of room for each and minimize the chance for aggression or squabbles between the two. 3 is probably doable and I'd imagine you could get away with it, but the more swimming room for these fish, the better. Also the TSN and the CK are going to grow pretty huge in that tank.
Remember that many other fish do not have the space requirements of gars. Basically, gars (and TSN) cannot use the available tank space all that effectively. Most fish can and will bend and maneuver, whereas the gars are completely stiff in all their movements. Also there is always the chance of adding more large robust fish if you'd like to add some tankmates later on.
Sidenote: If you get the TSN and CK small and grow them out you should have some kind of cave, piping, tubing, or something for them to hide in. Both do not like heavy lighting and are nocturnal, so a diffusion of light or some kind of light-barriers are appropriate for both.
For the CK especially, IMO, they need at least 1 unclaimed space that they can wedge themselves into to hide from light and escape the other species in the tank. Then again the TSN might decide that it likes the space for the CK, hence my suggestion for a few hiding spots. A couple large chunks of wood towards the opposite ends of the tank would work well.
Once they get larger its a different story.
Remember that many other fish do not have the space requirements of gars. Basically, gars (and TSN) cannot use the available tank space all that effectively. Most fish can and will bend and maneuver, whereas the gars are completely stiff in all their movements. Also there is always the chance of adding more large robust fish if you'd like to add some tankmates later on.
Sidenote: If you get the TSN and CK small and grow them out you should have some kind of cave, piping, tubing, or something for them to hide in. Both do not like heavy lighting and are nocturnal, so a diffusion of light or some kind of light-barriers are appropriate for both.
For the CK especially, IMO, they need at least 1 unclaimed space that they can wedge themselves into to hide from light and escape the other species in the tank. Then again the TSN might decide that it likes the space for the CK, hence my suggestion for a few hiding spots. A couple large chunks of wood towards the opposite ends of the tank would work well.
Once they get larger its a different story.
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