Red Slime (AKA Cyano bacteria) and Dinoflagellates are two problematic algae that can potentially harm many different tank members. They are fast growing, so they can grow over corals and invertebrates, and they can alter tank water chemistry. Fortunately not there are remedies do get rid of them. Ultralife, Chemi Clean and Fauna Marin all make products that have become very successful at helping hobbyists rid their tanks of the problematic issues. Make sure to follow all instructions carefully when treating your tank. Should you have any questions please contact us.