Sounds like you do not want it.You have very few options. If you are getting bored easily, you need to reconfigure your tanks . One tank for breeders and another one for consumers of their product. Thus you'll get more flexibility. I am stuck myself - i have 2 smaller tanks that do not produce anything with very good and interesting fish and another tank which would be happy to consume any extra product that potentially i could provide in my space which is occupied by fish that does not produce anything.
I am so happy with cichlids which are handful, so that i would agree to get rid of all other fish I have and populate my 29g with nice platies and mollies. They will live jhappily and comply with their breeding programs while my ciclids will hone their hunting behavior on their babies. Sounds cruel, but cichlids are so irresistable creatures that you can forgot that ohter fish exist. It's controversial/. Do not criticize me.