My Aquarium

Start by changing all 6 tanks to "Large" tanks (goto Aquarium Design -> Remake Aquarium, then when you get the option, select Large). After that, put 4 Asian Arowanas & 32 Neon Tetras in each of them. Make sure your games saves, then quit the game and advance the system clock by six days then start the game again. Keep scrolling through your tanks until you get no more event messages from all of them (No more feeding or breeding ones). You should easily have more than 20 breeds by doing this (as well as more than 10 feeds). If by any chance you didn't get any breeds, then advance the system clock another 2-3 days and that should do it.