Hate to say it but: time. I have a couple of frags that I PO'd in various ways that caused them to brown out. One frag turned green after 3 months and now, a total of 9 months after it turning brown, it's finally getting it's brilliant red back. I have an electric pink milli with blue tips that browned out. A year later it's finally getting its colour back.
What I did find that helped colour back up was feeding my fish heavily while simultaneously vodka/mb7 dosing. Once I started feeding really heavy my frags suddenly spang back to life.
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