Here's a pic I found that looks a lot like what I have. They're called freshwater cepapods...anyone hear of them?
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Does your house get really cold at all? I keep mine ~70 and half of my tanks are unheated; guppies and such don't really mind.The only problem with adding a fish is I don't have a filter or a heater. I've been debating about adding a tiny frog; would get filter then. Do they eat them?
Except perhaps the temp.Get a betta. It fits your requirements quite nicely.