Maybe something added to The source water in your area that was getting past RO
I’ve seen instances where water lines in a building were treated and descaled with chemicals, eventually it got to My source water and I was screwed
it wiped out a whole freshwater tank
only reason I’d suspect that is because you said your DI was shot. You seem to Me like someone Who is aware of their DI lifespan so if it went quicker than Normal I’d suspect a bad membrane. Membranes go quickly when something gets past the carbon blocks.
i run a lot Of tanks and almost always can link
Mysterious death, recession, red algae to RO issues.
it also seems like a lot happened in a quick time, over feeding, lights on for 48 hrs, DI media shot.
corals look lighter almost pastel toward the end in your pics.
Ive also noticed sometimes I have the best coloration on SPS right before a crash. Strange pastels I’ve never seen, It’s like they’re giving it all they got to survive. Maybe it’s a result of struggling to photosynthesize or photo-inhibition or something else that sounds like I know what im Talking about.
regardless, you’re a skilled reefer and I know It hurts losing an SPS tank but I think if you take a break you will come back stronger.
sorry