Mrs Peers: Thanks. Tap water is at 30 tds and my ro/di unit delivers a good zero tds. I replaced all filters in June after 11 months of service. I think I have been always "safe" on that side. The February picture is actually what made me realize the scope of the "damage". Decline has been very slow but the picture comparison shows clearly that all my mushrooms colonies have severely declined and both Candy Canes are in bad shape. Even the "easy" green star polyps are looking bad!
On the positive side, the toadstool is doing well and the Xenia are growing like crazy.
Reefmack: I do not think I will get a Foxface but I will research other hardy vegetarian fishes able to stand their ground against the yellow coris and the stripped damsel. If the tank was bigger, I would get a yellow tang...
In other news: Got a brand new Salifert NO3 test: Absolute zero on that front.
Thanks Travis for the new forum.