ID Please bubble type thing

Twoddler

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Hi, was just doing some daily checks for aiptasia in refugium, when I so this bubble type thing growing on rocks in refugium. Could you please look and ID thx

20200906_172314.jpg 20200906_172306.jpg
 
Outer membrane, like some type of egg, just seen a black type creature with 6 or eight legs or more approx 3mm long run into the rock whilst I was trying so see if bubble or membrane, very strange, none in display tank that I can see, could nt get photo of preacher was to quick
 
I decided to remove the rock from refugium, if in doubt chuck it out basis. I so 2 black creatures, moved very quick, managed to video one of them move, centre, right of vid.... any ideas ?
 

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