I'm curious about these little creatures. I have pebbles, so from the reading, that might not be a good substrate for them. I was also curious about their shells possible adding calcium to the tank. Anyone with experience, send a shout!
They will use the calcium from the water to build their shells, so its the opposite of what your thinking.
I used to collect these from a lake behind my house when I was a kid.
They live in the sand and can be found at the surface of the sand or just below it.
I knew every lake in the area and only one lake had them.
I don't think pebbles would be good for them...
I don't know much about keeping them long term in captivity though.
I have some that I collected from around my place and I haven't added any supplements. However, if feed them brine shrimp sometimes. I keep them in just regular gravel and they like to bury themselves in it.
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