Added some elodea to the bowl to help keep water clean. Plants seem to be pretty happy, and I was able to buy some trumpet snails to help keep algae off them/mess up substrate! Also have a few little egg packets that I suspect are the pond snails enjoying themselves.
Unfortunately, shrimpies seem to be having trouble with moulting, at least I think. There were 6 total in the bowl (2 big ones and 4 smaller ones)--3 original that have been with me a month and 3 new ones I got a few days ago from the store.
Saw a molt yesterday evening after a small water change, woke up this morning to (near as I can count) 5 shrimp, then saw another molt tonight and the molter next to it moving very slowly and somewhat hazy in the body compared to the very clear non-molted ones.
Went to fix some dinner, came back see to other shrimp eating thorax of molted one!
I'm not sure if they are dying after molt, then getting 'cleaned up' by their fellows, or if they are just especially vulnerable at that time and unable to escape the bigger shrimps. Even not molting, they tend to be pretty aggressive towards each other. OTOH, Seattle water is apparently some of the softest in the country, and I wonder if there isn't enough calcium/whatever minerals they need in the water. May go get a cuttlebone and crumble it in the substrate to see if it helps.