LoL! My internet was down, sheesh. Sorry for the delayed response. Crenicichla sp. 'belly crawler' would be a bad idea for a 45...they need at least a 75gal....and even in a tank that big they are gonna let the other fish in there know who is boss. What this does is greatly limit you to your fishy selection. Saxatilis pikes stay smaller, and are more active, but they should be kept in a minimum of 55gal. SOOO it looks like you are gonna have to go in the direction of dwarf pikes if you want one still.
Crenicichla regani is probably the most common dwarf pike, with many many numerous differences in color within the species. Pimpin little fish. I would get a group of at least 4 of them and allow them to pair up naturally, then remove the other pikes once they do.
Crenicichla compressiceps is a little less common, but a totally kewl little pike as well. If you go with them you may end up payin more, but they are worth it. Do the same as above and you should be aight.
Crenicichla noto. (long name....too lazy to spell it out) is a rather aggressive dwarf pike and needs a larger tank than its cousins. So i would stay away from these bloaks.
Member that these dwarfs max out at about 4.5"....that not horribly big, lots of cichlids wanna make them a meal. So choose your tankmates wisely. Also, dwarfs aren't as robust and aggressive as the bigger pikes, so if they get picked on it can really stress them out. Just make sure there are tons of hiding places, PVC pipe cut into sections, and drift wood. Your gonna wanna have soft, acidic water, the more the better, if you wanna see good colors. I use RO water on my tankz, and add some peat as well as tons of driftwood to lower the pH and hardness. I know someone who keeps his pikes in 4.5pH SUPER soft water...lol...and they love it!
About the pikes teeth, for the most part they aren't really all that visible, like the psuedocanines of the Parachromis family....ie jags, dovii and the like. They ARE there though, and can draw blood, lol...trust me.
i cant believe peanut hasnt answered this yet, Im not for sure, but here is a beautiful pike, i believe its a dwarf species and you could probably keep a few of these little guys in there! Crenicichla compressiceps i believe is its name:
..... so he'll