Beautiful tanks. I'm extremely jealous of your reef. I had a 20gal reef and it was just too much maintenance compared to my 75g low tech planted. From trying to match salinity and temp, then pouring with buckets. Though, I'm convinced, if I invested in the correct equipment, it would have gone much smoother. I tried to do budget reef, just more work in the end. I only now have the planted low tech and planning to build a nano riparium.