Watch out for any aggression between the kribs unless they are already a pair. They may fight a little bit before pairing up, and it can get a little rough, being the cichlids they are. Just make sure they have plenty of shelter and you should be fine.
"One day...one day, this path will lead us to the White City, and the tower guard will take up the call: the Lords of Gondor have returned!"
–Boromir, The Lord Of The Rings