What fish are you looking for? The cutest one I've gotten and it's a rare one, is the rainbow unicorn. I do have this in my Myth house. Sadly, my house didn't make ratings so you'll not find it. My suggestion is to look at top rated x2, then put them in alphabetic order and start going down the list until you find one.
I have the private fishing resort and you are welcome to use it. Let me know date, time, place and Wizards name and we'll meet up. I'll then add you to my friends list so that we can teleport to my castle to fish. I am EST time zone--east coast so be sure to note time zone as well.