Out of the pictures you've provided it looks like you have a couple female guppies, and one looks like a male guppy (can't really tell in the pic). Just be careful if you have mixed sexes because they'll most definitely breed and before you know it, you have a 5.5g nano tank FULL of guppies(trust me, it happened to me when I was cycling a new tank). Maybe it wouldn't be such a bad thing since you have a turtle.
I use the same "cycle" fish as you are using. I have a 10g tank with over 100 feeder guppies (don't ask) so I use them to help my new tank setups cycle. I find them to be pretty hardy little fish that can withstand a lot of water parameter changes.
Can't wait to see the new plants when you get them! I love all the pictures! Thanks!
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Cydric
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