They go through in fresh AOK, but you CAN NOT have any thing else in the tank as every thing eats them, bite size. If you try to build a bit of bio film and rubbish (plant matter) but not to much rubbish, with small amounts of Chlorella powder and make green water, you will get some through and the ones you raise will be selected ones that are suit to you raising conditions, in turn the next generation will be more suited to what you do and more will survive and in a few generations they will be easy for you and how you do it, we all with out knowing select critters that suit what we do. If we always do things the same, food water changes and the like. Food don't have to be exact just close Green water is easy, a bucket of water from a tank, needs a lid, boil or nuk a bit of cabbage leaf, chuck it in and put the bucket in the shade, in a couple of weeks green water, OH not full shade it has to be bright with out getting hot. When it slows down through in some Mystery snails and a bit more Veg to keep it going. The best green water is like a glass of strong lime cordial and if you look under a scope you can see the little critters in it You need water form a well running and long running tank and best if you have put plants it at some time, the plants carry the critters. Once the shrimp stop free swimming they drop to the bottom and eat any thing soft, banana is good, in moderation. Time to stop banging on. Bob