I hope you are considering C compressiceps, which is still a bit large for the tanks you suggest.
One thing to consider with pike cichlids in a small space, make sure they are comparable in size, because larger ones will eat their smaller brothers and sisters.
I picked up a bag of 10 C sp. belly crawlers at a gcca cichlid auction, all between 1" & 2" and put them in a 6 ft 100 gallon tank to grow out, within a week only the two largest were left, and each had quite full bellies.

The slightly larger male the ate the other a few weeks later, being male he grew faster.
A friend who also picked up a bag of 10 at the same auction, also ended up with 1.
They never bothered other higher bodied cichlids, but any similar long cichlid seemed to be looked at as a meal.