I'm having a hard time trying to decide which, if any, of the common fish to keep.

IOW I bred a gold goldbulb, so do I need to keep the 2 common fish that made the gold bulb or just keep a breeding pair of goldbulbs?

I'm really trying to fiqure out how to determine which fish to keep not knowing if you'll need them in the future.

Any tips or hints on how to manage the overwhelming number of fish?

Thanks