Total anemone disappearence

[peseifert]

Need some ideas on total, sudden disappearance of all 7 BTA's within 4 days.
Tank: 150 gal 3 years running, fish, LR, softies, 4 rose BTA's I've had for years, 3 rose BTA's that came after a split, all 4-6 inches when open.
4 days ago, noticed several much smaller than usual, not expelling stuff, mouths closed. Next day, gone, as in vanished. Today, all gone - no sign of any of them, anywhere.
Did water change 2 weeks ago. Parameters: sp. gr. 1.025, nitrates zero, calcium >550 (always runs high, for years), Phos < 1.0 (noticed this 2 weeks ago with appearance GHA, started phosban reactor, Chemipure elite)
All fish well, clowns spawned last Sunday.
Lights: MaxspectRazor 43" Razor
Any ideas? Feel awful had several of these guys for years and multiple splits

 

[higgs83]

Is there any way they took a ride down into the sump? What kind of powerheads? I know my gyre makes nem soup pretty quick.

 

[peseifert]

Thanks, but checked sump -no one there
They basically shrank up to size of thumbtack from being as big as softballs.
Very strange