So far, from what I know, others have tried this and it works. Remember most important point is rare plants and rare fish should be around 60 percent. This is the key to being due a new fish.
Reef name and user name is the same.
I would like to share this with everyone having difficulty getting 100 percent on rare plants and fish. When I was leveling up around level 28 I had a difficult time keeping my rare plants at 100 percent, I purchased some pearls to get my rare plant level up, I planted 5 at one time and was surprised that I got 2 new rare plants and new fish at the same time. My girlfriend was also having the same problem at level 32. I told her to plant 9 ten pearl seeds and one 45 pearl seed. Just to see if the same would happen. She bought pearls and planted 7 extraordinary seeds and one 45 pearl seed (no more space). To my surprise and hers, she got 3 new rare plants and new fish out of those seeds. Her rare plants and fish went up to 85 percent. I can not guarantee that this will happen for you, but that is my experience. If you are lower than 60 percent I think this will work. I try not to give advice until I can test the results, but difficult to test twice. Had the chance only because of my girlfriend. Good luck and if u try succeed or fail please let us know. Remember, only if your below 60 percent you should have a good chance. I had a power reef for leveling up quickly, that is why my rares were low, same as my girlfriend.
At level 40 and finished I have all known plant combinations if anyone is interested.