An update: a few days after using my home made thingy it started to show a rust spot on the wire, so I went to PetCo and found a breeding box (plastic frame you draw a mesh bag up over) and they are in there now with some plants with the filtered water flowing right in. Most of the time I can't see them. I thought they died once but then I saw some hanging on a side of mesh in the current and realized that was some molted shells. They seem to be doing ok in there, but I have no idea how many are alive. Just waiting for them to get bigger. I give them First Bites twice a day but they are in the current and I've never changed the filter. Waiting until they get bigger to do that, since it provides them some food. Impossible to take a good photo, I tried. The mesh bag is white. :/