Already kinda discussed this with you in the visitor messages, but generally your dwarfs aren't going to get much larger than 5", if that.
Still think Crenicichla notophthalmus is the winner of the dwarfs, trumped only by wallaceii.
Definitely go for Saxatilis group if you have the space, or even Lugubris group. Crenicichla proteus would be a good candidate for sure. They are a Saxatilis group pike, but generally don't get larger than 8".
ok it a 55 gallon tank. here what i have found crenicichla proteus,crenicichla geayi, crenicichla lucius,crenicichla menezesi. can u tell me some info on these^