Can't stop the losses

[mandarin man]

sorry to hear about your losses.

I am just wondering what kind of KH test kit you are using? You might want to get a sample of the water to the LFS for a complete test (especially the KH). Test kits do go wrong even with high end brands like salifer or elos.

My mother had similar problem, all her corals shivered up and declined rapidly when all the parameters were all good. She was grieving for a few weeks. We could not figure out what is going on.

So I took my complete test kits and tested her water. It turned out that her ELOS KH kit was bad; her read 7dkH, but it was actually 3.5dKH. The LFS also confirmed it was 3.5.

I think it might worth while to let someone else test it.