I've got:

10-Gallon #1: The "Main" Tank, containing:
-13 adolescent wild guppies, males separated from females by a divider until they fully mature
-1 Blue Apple snail, female
-1 pink-bodied, ramshorn .5 inch snail
-3 tiny conic-shelled snails
-2 dragonfly nymphs (different species, and they each have their own territory so they don't eat each other)
~8 wisteria stalks, 1 giant clump of java moss

10-Gallon #2: The Gourami Tank, containing:
-1 three spot gourami, female (she will be transferred to my currently unused 20 gallon once I move--right now she is small)
-1 ghost shrimp, male
-2 assassin snails (they eat pest snails)
-3 wisteria stalks, 7 elodea vines, 1 melon sword

5-Gallon: The "shrug" Tank, containing:
-4 adult female guppies, 2 males
-5 wisteria stalks, small clump of java moss
-occasional birth batches of 1-20 fry, which I feed over the course of days to the gourami and dragonfly nymphs
-pest snails (to feed to the assassins)

The Sangria Jug (slightly more than a gallon), containing:
-1 juvenile crayfish, female
-1 adolescent guppy, male (I've been waiting for the crayfish to eat the guppy like she ate the bluegill I caught with her, but the guppy seems to be smarter and faster and has survived for months)
-2 pest snails. They breed often, and the crayfish eats the eggs. :3

And then there's a 5-gallon bucket with >100 dapnia magna and >100 baby pest snails (turns out they're asexual), an ice cream tub with >25 daphnia as a backup culture, an ice cream tub with 10 larger pest snails to feed to the assassins.

The daphnia breed every 4 days under optimal conditions, and are used to feed the dragonfly nymphs, the gourami, and the adult guppies. There are no guides as to how to raise dragonfly nymphs, so I'm winging it and feeding them as much as they can eat once a week (they only eat live foods). They've survived since early September, and both have molted once or twice. I also have an otocinclus catfish who is bumming around from tank to tank, aiding with algae control (though not as well as a pleco, in my opinion).

Anyone else nerd out with the aquatic like I do?