Argh, I should've known better. My acan echinata decided to to have war with it's neighbor hammer coral. Ate 6 heads 😩.
Light came on in the morning and some of the branches of hammer are covered with acan stomach that I had to siphon out.
Aftermath,
https://photos.app.goo.gl/mLSPWUbUa2pMESGv8
Oh well.