My husband keeps Lake Malawi cichlids. I highly reccommend them to anyone who wants colorful fish without the hassle of saltwater. The only downside is he won't let me serve tilapia for dinner anymore. Same fish, apparently :-D
Of course, it only started with cichlids. The dreaded Aquariphilia has now progressed to a second Rainbowfish tank, a third quarantine tank, and a fourth tank for the chip off the old block, because "having his own fish will teach him responsibility". We are rapidly approaching the "Hey, if we put a few tanks in the garage I could start breeding these guys- How soon can I retire?" stage of the disease.
Interesting. I won't even make any "Mickey Finn" or "get tanked" puns. ;')