OK, I played for some time, found the first two magic fish easy enough, stumbled onto the Grooper on my own. I sell tank fulls now for fast cash.
BUT, finally deciding I want to look up the formula for how to make the rest, I printed a page off a fan site. Now, I see THEIR formula for the grooper is way different than what I've been doing. And on this site, there is yet another.

So how many ways are there to make each magic fish???
I won't bother with cheat sheets if there are too many ways. Since reading that one, I've started automatically selling off fish not in the list of need to keeps.