Bought 15 for $30 from a local breeder. We have them in a flower vase. No filter, did seed it with a whole mess of ceramic rings from my QT filter. It's brackish water using marine salt. They've been in there for about 2 weeks. All are doing great. All eating well and no deaths. These guys are very active, they all swim around the vase. I have java fern which seems to be doing ok in brackish water. I put frogbit in there but after a few days it turned brown. I guess it does not tolerate brackish water. I hope they breed as easily as my RCS! Here are some pics.