Blue Clownfish - take a picture of a Clownfish 3 times
Randall's Goby - Take a picutre of a Goby 3 times
Spotted Mandarin Dragonet - Start application upon notification (I have them disabled, so not sure how this unlocked)
Clown Tang - Take a picture of a Tang 5 times
Cross Damsel - Take a picture of a Damsel 3 times
Jewel Damsel - Tap the upper left corner of the screen 1000 times
Springer Dottyback - Share on Twitter 3 times
Pajama Cardinal - Open application 20 times in one day
Camel Cowfish - Share picture of Blowfish 3 times
Potbelly Seahorse - Share picture of Seahorse 3 times
Pygmy Seahorse - Play at 4:00am 5 times
Leatherback Turtle - Open Mystery Chest 50 times
Mauve Stinger - Take a picture of Jellyfish 10 times
Manta Ray - Share picture of Sting Ray on Twitter 3 times

you're welcome

!!! :DDD!
Thanks for replying to my questions! & tysm for the pictures, they were very informative & helpful. :)
Good luck on lvl 13. c:

Does anybody know how to