What's this Clear stuff?

besba

New Member
My tank is about a year and 1/2 half old. I have this clear floating plastic looking stuff with something like air bubbles in it here in there. Got any ideas?
55Gal. 50pdsLR/60pds LS. 1 Regal Tang, 1 Foxface, 1Coral Beauty, 1 Firefish,1 black and white cardinal. Just added mushrooms.
 
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