I think once you invest in an RO/DI unit, a lot of problems may start to go away. I actually couldn't believe you were using tap water. I use it too, but I finally got myself an RO/DI . If I had a tank of that size with that many acros, I would have RO/DI without a doubt. I think it's a big cause to your SPS problems. I can keep SPS fairly well in a 20g with tap water, so I am looking forward to the results with using RO/DI water. At this point in the game with that much money invested in livestock, your doing yourself an enormous favour by adding an RO/DI system.
Good luck !! Hope you stick around... that's one heck of a tank.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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