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Never fed them and there is no filter.

Hi I have a question and hope you can advise.

I have an Opae Ula Tank in our library that was purchased from an educational marine center who did an educational program for us.

We have had the tank for nearly 1 year after several months it developed a thick carpet of algae that covered all ...

Is that a piece of coral in the background or a plant? Its gorgeous! Where did you get it?