What are these?

[Maintenance Man]

Hello this is bc_grl husband here . hello everyone . Some more info on the second picture . It has three mouths not two , and at night it folds up into a dome shape .The only pictures I have that come close to it ,is in my marine atlas , they are Amplexidscus fenestrfer ,at night . and in the day it looks like Ricordea but with three mouths.When the tanks lights go out tonight I will take a flash light and have a closer look at it . And thank you for the imput folks