Been daydreaming for a while about having a 20 long, and finally was able to make it happen. I'm not completely new to the game, but this is the biggest tank I've done so far. I have a 2.5, 1.5, and Walstad bowl as well, and since they all run decently well I figured why not.
Album here... http://imgur.com/a/rmcSW
So...what it's got:
Aquaclear 50 HOB
Hydor 150w heater
2x 23w 5000K CFLs in basic clamp light fixtures
Floramax/pool filter sand substrate
Banana plants x3
7 black neon tetras
1 penguin tetra (LFS getting more in in a couple days, this one came with the neons from petco)
2x julii cory cats (most likely three-lined cories, sold at petco as juliis. Did some research, and mine do look more like C. trilineatus)
1 blue dwarf gourami
I didn't have anything specific in mind design-wise, just wanted to try some stuff and see what looks good to me. I'm not really planning on adding many more fish...maybe a couple penguin tetras and cories to go with the ones already there. Everyone seems to get along okay, though the cories still get skittish at times. And even with my meddling, the plants are making themselves right at home; I found what looks like a bit of rotundifolia sprouting from the gravel this morning. More coming; the way these plants are taking off already, this should get interesting.