Okay, about 7 months ago my girlfriend bought me 2 fish for a present. I quickly became engrossed and got more, and they all died. Well except 2 of them. I did my research and it was because I did not cycle the tank. I then bought a 55 gallon and cycled it before moving the surviving dwarf Gourami and red wag platy into it, I then purchased 6 glofish, and 10 red tailed rainbow sharks. After 5 of the 6 glofish died but everyone else was living still, I gradually introduced 3 black mollys, 3 panda platys, and a bristlenose pleco into the 55 gallon, and had no problems whatsoever. I had one incident where one of the sharks killed a platy but nothing else after that. I simultaneously had a 10 gallon housing a crown tail betta, and 5 neon tetras. I bought a 40 gallon, cycled it and decided to combine the two tanks fish together to make one single community, minus the sharks whom I have rehomed. I have had no problems and every fish gets along and lives fine together. But I have read recently that, not only should the sharks be kept by themselves with only 1 of them, but that also the betta and gourami, glofish, and pleco do not get along. So I ask you did I simply get lucky? Or was this due to the heavily planted aquascape, and water conditions I provided?