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It does look as though it has started to strip around the edges a little
Yeah agreed, that doesn't look like it's in a good way Is your NO3 really 0? And are the rest of your results stable from test to test?
If your tests are all good and have been reasonably stable I'd probably run some activated carbon , just incase there was anything extra in the water that shouldn't be , it will also help reduce the toxins released by your softies if planning more SPS , as the two don't agree with each other . I feel the stripping probably was a result of the Po4 reaching higher levels before adding media . It may take weeks to see what way each coral affected will go , some may pull back others may continue to strip just really slowly before dying completely .
Ok Cornet is now dead, now one of my Stylophora is dropping polyps too !Alk is completely stable at 9.5 however looks like PH is down to 7.7 am I correct in thinking that low PH inhibits the absorption of calc and alk ions ? This would make sense as I’m not dosing and don’t appear to be dropping calc or alk - to be honest I’ve been poor at checking my PH so I’m not sure if this has dropped or when but thinking PH would be better around 8.2-8.3 ? Safe to buffer PH without buffering Alk and in what increments. Also LFS to me to raise temp from 24.5/25 to 27-28 is this good advise ?Cheers all
Worth having a read of this:Low pH: Causes and Cures by Randy Holmes-Farley - Reefkeeping.com