I know to each their own, but what should be a base guideline for a nem? I had one that lasted over 6 months when my tank was only 6 months old. Biweekly water changes helped me keep that one alive. Now that I have had my tank up for 18+ months, I have learned more about water chemistry than I have ever wanted to before. I do weekly water changes, run biopellets, and now have my calcium reactor to keep alk and calcium up. LMK. oh yea, I dont have a reactor to run carbon to clarify the water, would a bag of activated carbon in a high flow area (overflow, sump near return pump) help?