This is my first time having a betta in a community tank. It's a 20 gallon long, and will ultimately be heavily planted. The male betta I'll be adding has, according to his former owner, done well with other fish. The other inhabitants of the tank will be three platies, eight von rio tetras, and some assorted snails. My question is, should I add the betta before or after the other fish? I was planning to add the betta first, but I've seen a few people say that bettas should be added last, to decrease the chance that they'll attack the other fish. Thanks!