Hi, thought I would answer the asked questions. My tank is 2.5 years old. It is a mixed reef but still SPS dominated. I do 10% water changes every other week. I use roughly 35 Ml a day of BRS soda ash and calcium carbonate before the crash. Now, it’s about 16 ML. I uste to do weekly 10% water changes but I struggled with low nutrient based issues. I will say that at that time the corals were happier. For now, I don’t want to change anything until I see the ICP results. Then I’ll make some changes if necessary and do another ICP test after the changes have had some time to take effect. Looking forward to seeing results!