some updates
we observe that the sps were not extending their polyps that much last week... water tests were all good... so we decided to do a big water change (30%) and everything is doing better now... ORP got from 315/320 to 400...
maybe some colonies got some chemical out that affected others..
the mysteries of reef keeping!
after reading many positive things about biopellets we decided to install a reactor to try it out... we bought biobeads (less costly then the biopellets) that arrived today and we will install everything this week-end

I'll keep you posted about this
