i think is was a middle one
She becomes a mermaid when she finds out that her grandmother Gracie was a mermaid so she swims in the pool in an island at full moon and then she shows Lewis and he's like OMG putting his hand over his mouth.
Plucking
water finds its way into small cracks and when it freezes it expands making the crack bigger
Yes he does because Zane gets tired of all of the secrets and then Dr. Denman gets too close to the girls and they get stuck in mako island. Zane walks through the pathway and see's the girls. He finds out their secret because of Dr. Denman.
Arciolagist
He finds out on episode 53 season 1.
Will finds out in season 3 episode 10 "Revealed" when he spills water on Bella, she dives into the water so he won't find out but he follows her and finds out she's a mermaid. Can he keep her secret?
In Mermaid Melody Pure episode 14 & 28 Kaito finally remembers some parts of Luchia then on episode 32 he remembers every thing
A twist in tail
the last episode is called the journal. it is when he finds a journal of the stuff his parents did.. you can watch it on netflix.
The episode is called "Harper Knows". It is in season 2 and is the episode were Harper finds out the Russos are wizards.
The Farnsworth Parabox
The episode aired during season 8 and was called In Marge We Trust.
In the episode that she finds out alex is a wizard
two teenage girls finds a mermaid in the pool the mermaid wants to show his dad that loves exist the mermaid fall in love with the lifeguard wich name is raymond the girls help the mermaid by setting up a date for her
Rikki-tikki finds refuge in a bungalow and is rescued by Teddy and his family. Teddy's father helps Rikki-tikki recover and offers him a new home in their garden.
derek