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Second that. Also have u noticed any livestock problems?What are you testing po4 with ?
Is it just me or is that cyno on the bottom right? If you have cyno I would have someone else check your water quality. You say you have 0 P04. What test kits are you using? Hard to believe you have A tds of 2, 0 Po4 and cyno. do you use somekind of P04 remover? Sorry for your loose. They were nice size colonys.
Welcome to the world of sps. You have to check everything all the time, be paranoid, recheck, have someone else verify your checks. And then stuff still dies. You aim to control the factors we know about it, lighting, flow, nutrient export, alK, CA, Mag, Nitrate, PO4, temp, feeding, pests. You try to keep them stable. But there are more parameters to track, we just don't know what they are. So you try to be diligent, cautious, meticulous and keenly observant. And make sure your wife is okay with your SPS budget because it grows and grows.
Oh by the way. Its always alk, check everything else but its always alk. If you can keep alkalinity stable, then you are undoubtedly doing everything else right. I am not being flippant about alk, if you are measuring and observing your alK routinely then you are most likely measuring and observing all the other factors as well.
maybe this sounds crazy but after I got the 2 part dosing fine tuned My parameters don't change unless I do a water change. then the cal goes up and alk goes to 8.5 mag goes up to around 1500 for about a week then everything settles back down to the parameters I posted.