Humm, possibly a tumor of some sort. Research mushroom diseases. It's not splitting, they make the mouth first and then grow apart. Could also be injured and that's just mass. Is it the same color? I would suggest to leave it be. The mushroom looks very healthy from the picture. As long as it doesn't shrivel up or look purplish, it's ok.
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30g reef tank, CPR CY192 filter w/ DIY plumb running Rio 17HF return, Coralife 3x 9w UV Sterilizer, 3 24W T5-Helios 10K Daylights/3 24W T5-Helios Blue lights, 2 Logysis blue meteor light strobes (moonlights/24 Blue LEDs).
Tiger tail cuke, asst. snails/hermits, asst. feathers, rainbow acan,zoos,shrooms,bubble,galaxea, asst. shrimp, 2 ocellaris,mandarin,zebrasoma xanthurum,pink-spot watchman,red-striped pistol. |