congradulations on finding them so small. I could only find them at 4-5", I would love small delz. I would keep similar size fish with them, they can be kept with anything that wont bug them or eat them. They will get aggressive as they get older. Ive kept delhezhis with other bichirs, cichlids, snakeheads, schooling fish, and even by itself. For breeding, I would suggest getting 3 more for a total of 5 and getting at least 100-150 gallons.