black spots

My Saltwater aquarium is 1 and half years old and Why my rocks are turning black colour?

Hello friends. I've been having some trouble with my corals lately and am concerned for one in particular. I have a medium to large Wolverine type favia colony. It had a small black spot on it when i got it but was told it was just algae. I'm no starting to see more of them and I'm worried...

Hello! So I got these 2, True Percula Clowns (says PetSmart) about 2 months ago. They were on sale so I got both of them. The darker one (I'm assuming is the female) is getting black spots on her body. My question is, is this normal? I mean I'm very cool with it, just curious :)

Noticed about 5-6 black spots on my female clownfish. She’s acting completely normal. I’m working on getting a picture of them but they aren’t cooperating. Any ideas? They love to swim around my torch, hammer and Duncan.