They are doing very well as one specimen. Should you increase more fish, know the flowerhorn’s tendency for territorial aggression and be prepared to rearrange your tank. The Black Ghost Knife fish provides excess unusual condition and movement towards your tank! Having no dorsal or caudal fins, they slip through https://www.mediafire.com/file/moub1bzbznax5qb/How+to+Maintain+Discus+Fish.pdf/file