Hmm thats a good idea. Just did a little looking around on the internet and it seems like that would work, and i read and have been told that kribs and rainbow sharks can live together as long as there are 2 caves. I was looking into a blood parrot also. I dont wanna hear any crap about how they are mutants and whatever else. They need love too! Lol. Both of these cichlids can be successful with rainbows and tetras so looks like i have some choices.
they would have territories, but it should work just fine. The thing about kribs is that they don't show off their best colors alone (typically) Though you should provide a cave for each.... one for your shark as well. Put one in the middle and one on each side of your tank and you should be fine, they will argue a bit while they establish a home base but that will settle down after a while. I have kribs and rams and they do get alone fine once they know where home is.
If you really want to keep both the raphael and shark in the same tank, get lots of pieces of wood, plants etc to keep on the bottom and break up line of sight. I have a rainbow shark and african featherfin catfish sharing a tank and since they have had more wood and plants added, they hardly if ever get aggressive with eachother and when they do, one is always quick to move somewhere else. I also have angelfish in the tank and so far I don't think the shark has even noticed they exist, or if it has it doesn't care enough to nip at them because they hang around the middle and top of the tank.