Planted Tank Obsessed
Join Date: Jul 2009
Location: Chicago, IL / Philadelphia, PA
It's possible that it could come back but it would probably take a long time. I don't think a 3 day black out could have done the moss in on it's own though. I've had moss in blackout conditions for a couple weeks before and it was still green. What else is going on in your tank? If you're doing a blackout, you must have an algae issue. My guess is that the algae is overtaking the moss or out competing it for nutrients and that you should probably scrap it and get your water parameters and fertilizing in check and try again.