Somewhat of an update.... I decided:
1) To get a 40ish gallon or so tank and move the inhabitants of the 10 and currently occupied 5 gallon tanks into this.
2) Use the 10 gallon for dark green shrimp
3) Use one of the 5 gallons for yellow shrimp
4) Use the other 5 gallon for red cherry shrimp
5) Get some snails too and distribute between the tanks - haven't decided, maybe spixi, malaysians (b/c they look cool

), some type of ramshorn??? It'll be a while before I get to snails.... it'll be a while before I get anywhere. lol.