Okay might have some good news or something hopeful. I had your problem a couple months ago when I sold a bunch of fish, my nitrates disapeared and with out it my Xenia died and everything else looked bad. GSP closed up, Kenyan trees looked dead or dying misc. polyps closed. The only thing that did not look that bad was my Frogspawn. Two months later everything is back and looks even better. I now have twice as many Kenyan trees as before the GSP and other misc. polyps are open and thriving. My Candy Cane and Brains are doing great. I have a little bit of algae on the sand and one rock but it is clearing up slowly. I do run a phosban reactor. Hope it all works out.