Whats wrong with my Clams?

[MarkoD]

Just FYI since my refugium light died I've been doing weekly 30 gallon water changes for the past month. Got a long hose and pump.

I shut off the valve to my fuge, drain the water, refill with new water and re open valve.

Since starting these water changes my huge elegance has closed up

And it solved the aptasia problem with a copperband