Bizarre bouncy alien purple BLUBBERYTHING!?

[Zan's Aquatica]

I found this hovering over a coral, it’s bouncy and blubbery about the size of a thumb nail, it’s very purple, i feel like it can be damaged easily, whatever it is?? i cant even guess?

 

[KJ]

Sponge.

 

[ReeferSteve]

Looks like a sponge

 

[Zan's Aquatica]

ahhe! okay! sponge! thanks all,

i thought its a sac of eggs