Great thread--there are some beautiful tanks here.
Here is my ultra-low tech, low maintenance shrimp tank. It's a 3 gal. Mr. Aqua, soon to be upgraded to a 10x10 cube. I keep it on my desk at work.
I have sold out of this tank over 500 shrimp in the last 4 months. Previously I kept cherry and tiger shrimp in a 15 gal., then a 40 gal. tank. I estimate that in those larger tanks I had >1000 of each at any given time. Unfortunately, during a tank reorg. I moved about 300 of each into a 10 gal. Metaframe tank. I lost them all to some sort of poisoning. I posted about it here: