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Hi, I'm starting up a 20 gallon tank. I just put in some TSS and I'm planning on going out and getting some fish in a couple of hours. I want to put some platies, guppies, and neon tetras in the tank. My questions were how many should I do of each? And which should I introuduce first? I know I shouldnt put them all in at the same time and should stick with the hardiest first. Then after I introduce the first fish how long should I wait? Thanks!