well here is some info on them and they get closer to 4 inches not 2. the ones you are getting will probably be about 2 inches big. http://www.planetcatfish.com/common/species.php?species_id=221
Start with water that has few to no minerals. RO or DI water.I plan on making a black water liquid additive out of the oak leaves for water changes to combat the ph and hardness of water.