I have started to notice these blue-green marble like things growing in my saltwater tank. Was wondering what they were, and what causes them. They don't seem to cause anything any harm. Also, for those experts out there. I was told if I bought a long tentacle bubble anemone, that my tank bred clown fish wouldn't swim in it. 1)because its tank bred 2) because its a long tentacle bubble, and not the expensive one. Is this True? Thanks!
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