I was about to try forwarding you the same link that Zman did. That’s a pretty good site.
I personally have 4 different pairs of Species.
Regani
Natho.
Compressiceps
Xingu I
The first 3 are dwarf, Range from 3-5 inches. The last one is a big guy, max size is about 16 inches. As you can see they range from 3-24 inches.
The water conditions vary from 5.5-7.5. Neutral would be good and acidic would be better. But from my experiences, they’re not fussy.
They can eat they have a temper. Not as bad as people think though. I have my Xingu I, with a GT, JD, and Jag.
Check out the website that Zman sent. You’ll find some good information. Pike Cichlids are my favorite and the pictures don’t give them justice. Their color and behavior in person makes them a joy to keep.
Cheers.