Kipp and Jerry - Yes Kipp, you are correct about the fish, but there weren't any fish for many years. Even the number of years when there were no fish, there is and was a healthy population of snails which produce fertilizer as well. The side affect of the addition of fish again has been too much nutrients and algae growth issues, but it is a balance to be maintained. Not sure I can recommend any particular nutrient but I agree the Crinums need something assuming there is plenty of light. -- Alani