i have a black dragon guppy. he was one of the first fish i ever bought. thru all my mistake (4 dead fish, a few returned to the shop as they we're ill when i bought them, fish i returned to the shop ie neon tetras going pale as the lady in their assured me coral sand wouldn't effect them) i now know about ph levels. yay me. he just fights on and loves it. i was catching fry about two weeks ago. little fry that i'm sure are swordtails. when to my amazement i see another fry slightly bigger then alot alot bigger once i see how long he is. nobody would mess with him i kinda know why after two more weeks he's tysons son! i named the only black dragon i've got tyson as he's just so hard. tyson is the only fish in the tank that don't move for anyone. he's probably the smallest too. he even makes the gourami move and he/she is around 9cm and quite fat. think fish that survive are just meant to be.