It doesn't look that bad. I bet the ET became a floating stand then rotted away on the surface. Mine tries to float after three weeks or so, the ferts and light only speed the process. Looks like you have a bit left though. Everything else looks nice and green. Back to the drawing board!
Haha, I'll probably be there myself in a week or so while I wait for a new needle valve from Rex, my last one blew and I'm trying to save the tank with DIY in the meantime... lots of blue on the drop checker.
