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Sorry for the delay in replying. You could try reseeding with Prodibio or an equivalent or , and this would be my preference, replace some live rock. I say it's my preference because I belive that the prodibio product and the similar Fauna Marin product claim to provide cultures of 5 bacteria, and I thik the exact bacteria needed/provided is still open to question. At least with some decent quality live rock you are getting a better, wider variety of bacteria. In response I know of people who use these bottled cultures very, very successfully to avoid bacterial monoculture so who am I to doubt the professional companies work.
I tihnk one of the reasons tanks that have been plagued with algae for a long time take a long time to recover is that people kill back algae and wait for the bacteria to take over, howwever the bacteria are long gone.
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