Advice Needed....Guppies, Tetras, Cories...

Thanks to everyone for their advice!

I should have been more specific one 2 points:
1) The 10g already as a function....I am getting some wild endlers from a friend and they need to be kept away from the guppies as they have never been interbred with them; my 10g is reserved as my Endler only tank
2) I am interested in genetics in livebearers but as of right now, I am purely doing as AshK suggested...I just want to see what happens....just watch traits get passed along. I couldn't care less if I ended up with mongrels that have no color...I will love them just the same. I'm not a perfectionist (in this case) and have no (current, once again, you never know what will happen in the future) plans to become a serious breeder anytime soon. I like the idea of having a few in the 20g and then if I decide I want to separate things out, etc...I will invest in more tanks when the time comes. As of now, I just want to test the whole process out. I'm not going to "dump in a bunch of guppies"....probably just a few to start. I want to practice raising them before I decide to do anything more with them. But thanks to those of you who were concerned about that, valuable advice for the future.

Most of you will be happy to know, I am definitely going to turn the 55g into a community tank and now I am SO pumped about it. I plan on adding to my current schools slowly, but I am thinking about ultimately having things be:
6 Pristella
6 Longfin Blackskirt
8? Danios
5? Cories
...And if there is still room, perhaps some platies?
 
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