03-12-2014, 03:57 AM
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No, they aren't filter feeders. They feed on microscopic food in the aquarium, like algae. They'll literally eat practically anything, they graze all day long, walking around the aquarium using their front legs to pick at food. Mine even steal bloodworms, and fight my fish away from pellets!
Sometimes if I'm doing tank maintenance I'll even have a few start picking at my hands. Definitely an odd sensation, haha.
As to filter...I think that's up to you and your aesthetics. If you can fit it, the Azoo Palm Filter would be great, or else you can use a small sponge filter. You could probably go without if you use a lot of plants and include a few floaters and allow the plants to get established/growing well before introducing shrimp. They just really need stable and safe parameters, from my experience.
Um, it depends on how cold the water gets. If your water gets to below 73 without a heater I would say yes. I keep mine in a heater-less 38 gallon, but the water never dips below 72-73 on the coldest days.