I have my pair of channoides in a 1 x 1 x 1 foot cube...I hardly get to see them. They hide a lot in the leaf litter and plants...cause they are SOOOO small and cute. I've been told you don't need filter, but I can't bear the thought of it. It would be like asking me not to bathe. Yuck. I use a very small hand on back filter that they seem to like, actually. They love swimming through the water current.
Unfortunately, I'm not an expert and am just sharing my experience (all three days worth) of owning a pair of these fantastic fishes. Read what you can, is what I will advise you and you'll enjoy them.
As for tank size, I tink 15 inches x 6 width is ok...not sure about 6 high, should be ok but make sure you cover the tank cause they can jump. When they were catching the fish for me at the store, the female showed her true jumping abilities. Surprised the heck out of me.
Good luck!
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