Time to introduce my new water Tatzl Jezu!
 
He spends most of his time near and in tropical waters. His bioluminescent stripe and natural night vision makes it easier for him to navigate the dark sea floor at night, It also scares away the more feral predators. Though daylight can be a bit harsh on his eyes as they need time to adjust.
 
He catches his unsuspecting prey as they go for a casual swim above the depths and his diet can be from small sea life to a whole pony!
 
Jezu is never prey and he can be either gentle or aggressive depending how the prey acts.  
He also likes to toy around with them, using his 5 tentacles, exploring around the preys body, making them more submissive as they go down!  
He is much bigger than your average stallion too. Lets just say a head or two taller.