It never bothered my clam, snails, hermits, or shrimp. I don't think I've used it since I've had the urchin though. I always put an airstone in the tank to keep up oxygen levels.
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72g bowfront, t5.
29g JBJ nano cube, ATI 26HD.
Livestock: clown fish, chromis, coral beauty.
Corals: Toadstool, maze brain, candy cane, mushrooms (purple & green hairy), button polyps, green zoas, GSP.
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