need ID and...

[Headhunter]

a cure...I'm nearing the end of an epic and expensive battle vs the majano anemones.

This new stuff appeared overnight after most recent WC. it's on my coral and sandbed.

Thank you very much in advance.

 

[Michael Hoaster]

Hard to tell from the pics. I'd guess cyano bacteria, diatoms or possibly even dinoflagellates. For anything besides dinos, it's the usual recommendation to lower nutrients, get more snails/clean up crew, and consider adding a macro algae to compete for nutrients. If it is dinos, consult the excellent threads here on RC for a cure. Good luck!