It's one that always give a rare plant. Supposedly a high value one, but that isn't always the case.
How do you know when you are "due" for a new fish? I am at level 30 and I have been planting mystery seeds every day and I can not get a new plant...just same low level plants and no new fish. I have not had a new fish for at least 3 levels. It has been so long that I can't remember when it last occurred. I also just cleaned out my reef to get my percent down in the hope that something would happen but no such luck. Any advice would be greatly appreciated.