ID Please, Sponge?

[ReeferDad93]

Have this growing in a few spots. Curious if sponge or algae. Movement is “bouncy”. Almost Jelly like.

 

[Steve and his Animals]

Sponges are fairly rigid but soft, so I don't think so. A picture under white light helps.

 

[taricha]

Curious if sponge or algae. Movement is “bouncy”. Almost Jelly like.

not a sponge. algae of some sort.