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· Super Moderator
Fry Daddy! Multiple tanks, reef, seahorse
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33,751 Posts
Welcome to TRT,

it’s really hard seeing anything under blue lighting. Try to get some photos under the white lights. Also more information on your tank. Age, size, filtration and other things.
depend on age , newer tank it may just be ugly stage. But on a mature tank it could be a number of things.
 

· Super Moderator
Fry Daddy! Multiple tanks, reef, seahorse
Joined
·
33,751 Posts
Is it actually black and growing on the coral or just around the base. It maybe a sponge of some kind or even a type of black bacteria like cyano. I’m thinking a sponge of some kind.
Have you felt it. Is it slimy?
 

· Super Moderator
Fry Daddy! Multiple tanks, reef, seahorse
Joined
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33,751 Posts
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