tranceFusion Posted October 18, 2020 Share Posted October 18, 2020 Not sure what this is. It jiggles and seems to be hollow or fluid filled. It also seems to be narrower where it protrudes from a small hole in the rock. Quote Link to comment
Joevember Posted October 18, 2020 Share Posted October 18, 2020 Bubble algae have pretty hard bubbles from my experience. If it jiggles it might be a sponge. 1 Quote Link to comment
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