[laverda]

I agree you really should not be using sea water at the risk of contaminating your stock. You should not need to do water changes that often, as they love dirty water. i also agree they do not need light to grow. I do not have any in my display or sump thanks to a file fish and peppermint shrimp, however I have plenty in my unlight overflow. Yes they do prefer light but clearydo not need it. They are about the easiest species to propagate. Use a razor blade to cut them off just above the foot then cut the main piece down the center starting at the mouth. Eat them settle and you will have 3. For food you might try nitrate directly.