Wow.....I stumbled across your thread and had to read all of it. You sir have an incredibly well thought out and beautiful system. Everything appears vibrant and healthy. I am in love with your space invaders; my favorite in your tank. I am looking forward to seeing your progress on the ATO/AWC system and may copy some of your design; please keep us posted. You mentioned something called a "salt hopper" that can automatically add salt to make SW. I know you are choosing not to use one but could you explain what that is exactly and how it works? I've never heard of a hopper before. Also, it seems you have most experience and wonderful growth with LPS (not that your SPS are doing poorly!); what tips can you give regarding keeping LPS so happy, colorful, and vibrant? And I didn't see it mentioned, but what do you like to keep your parameters at, what supplements do you use on your system, and what kits do you use to test? Do you keep track of additional parameters such as potassium, iron, iodine, etc.? And do you use/dose any carbon source? Sorry for all the questions. I am in awe of your system and thank you for sharing your experience in detail with wonderful photos....I am not worthy