The Three Tails

Plot
Close friends Sofia, Emily, and Selena are caught up in a storm one night and swim to a cave for safety. Upon a moon and uttering some text inscribed on the cave they were transformed into mermaids.

History
The Three Tails Youtube Channel

The creators originally hoped to send their series to Disney and get it turned into a TV show by 2012, though this idea has not been mentioned recently.

Season 3 was delayed by the girls going on vacation for most of the summer, and again by a bizarre glitch in their editing software. In August of 2013, it was announced that the series would be adapted into a film, which would come out December 2013. The cast claimed that it would be available on iTunes, DVD, and possibly in theatres. Filming began in Puerto Rico, but took longer than expected; a later announcement put the release date closer to early 2015.

Cast
Natasha Garreton as Emily Emery

Sofia Garreton as Jackie Sky

Marlena Rayne Lerner as Selena White

Ruby Rae as Mia Thompson

Saga Dios as Nikki

Julianna "JJ" Goldsmith as Faith

Sophie as Olivia

Season 1

 * 1) A Waters Change
 * 2) The Fight
 * 3) Cancun's Waters
 * 4) Birthday Tail
 * 5) Charmed
 * 6) Halloween Horror Night
 * 7) Study Hazard
 * 8) Mia's Revenge
 * 9) Christmas Disaster
 * 10) The Attack
 * 11) Sea Change

Season 2

 * 1) Pressure Tail
 * 2) Tail Trouble
 * 3) School Tail
 * 4) Fish Can't Swim (Sink Or Swim)
 * 5) Answers or Not
 * 6) Power Outage
 * 7) Scaly Troubles
 * 8) Black Revenge
 * 9) 1871
 * 10) Part 1
 * 11) Part 2

Season 3

 * 1) It's Back
 * 2) Back Again
 * 3) Christmas Magic
 * 4) Is This a Trick?
 * 5) Spells & Magic.
 * 6) Secrets Aren't Safe
 * 7) Somebody is Hiding Something
 * 8) The Final Countdown
 * 9) Part 1
 * 10) Part 2
 * 11) Part 3

Additional Info
Here is some of their Youtube videos!