I was so happy to meet some of you at the last meetup. I've had a mixed reef tank for 3 yrs now (125 g), haven't introduced any new fish in at least a year, and am trying to focus on upping my coral game. I bought a bunch of small frags and a member was awesome at giving me so me great advice on placements as well as water parameters. I've been testing with API kits and have thought everything was going well. I haven't really dosed any chemicals based on those kits. But then I just bought Salifert kits and a Hanna checker for alkalinity - and they all read wildly different. Last water change was 1/3 volume on 4/24. I put in a poly resin filter and a phosphate filter into the Eheim (have Eheim and sump). 5/6 test with API: pH 8.2, kH 11, ammonia 0, nitrite 0, nitrate 10-20, phosphate 0.25-0.5 ppm, Ca 440 ppm. 5/6 test with Salifert: kH 16+(ran out of syringed reagent), Ca 500+,phosphate 3 ppm, magnesium 1470. 5/6 Hanna kH = 14.0. Salinity was 1.027. I added 5 g of RO water and tried to figure out what is the best to bring down alkalinity (but even with google I don't really know and it said having corals might bring it down?) Retested last night 5/15. API: pH 8- 8.2, kH 12-13, ammonia 0, nitrite 0, nitrate 0, phosphate 2-4 ppm, Ca 460 ppm. 5/15 test with Salifert: kH 16+(ran out of syringed reagent), Ca 500+,phosphate 3 ppm, magnesium 1440. 5/6 Hanna kH = 14.1. Salinity was 1.026. Not good that I have 0 nitrate and will increase feeding to hopefully address this. Also ordered some SeaChem phos guard that I'd like to add to my eheim (the filter pad is most likely saturated at this point and leeching back out). Any help on how to bring down my kH and what I should be adding in general to keep these new corals (both SPS and LPS) happy would be so appreciated! I already have easier coral (lots of mushrooms, xenia, star polops, kenya tree) that seem happy (spreading) but some of one of the new ones died within the week and others don't look so great (the encrusting types).