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One more thought-- it kind of looks like a small, flat blue mystery snail. Can they live in brackish water?
Thanks!

Hi there! I'm cycling a new tank for my first Opae'ula. It's a four gallon glass cube containing lava rock, fake corals from Ocean Aquaria, Mustafa's macroalgae, and a few of those green algae rocks. (I know the green rocks were a silly purchase, but they look so nice and I hoped give the little shr...