Can anyone tell me if this is healthy growth or something else?

Meesh

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Hi there ,

Just restarted my tank with bleach coming up 3 weeks here this Wednesday. I've been starting too see this new growth on a sea shell in there? Just wondering is this black looking algae good or bad? Pictures for reference. Thank you

20210607_094500.jpg 20210607_094516.jpg 20210607_094540.jpg
 
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