it was so pretty in my lfs and now it is turning brown. it is actually my moms aquarium (its at her house) but she has no idea what she is doing so i like to do all the work for it and she just buys the stuff but she insists on feeding and feeding and turning the snails over when they are upside down "because he needed help" OMG she's insane

...please help im worried about my coral and ps my lfs said this was a mushroom coral???
i think it is like a polyps something or another, are they usually all different colors? the part that worries me are they dark orange/brown ones they are now getting black lines in the middle...