Kuhli Loach identification

[Geordie Paul]

Does anyone know what type of Kuhli Loach this guy is? He's always just had a blue/grey body with no stripes. I've had him for over a year now and still unsure. He's very healthy and comes out to eat every day. Any thoughts?

 

[Geordie Paul]

Does anyone know what type of Kuhli Loach this guy is? He's always just had a blue/grey body with no stripes. I've had him for over a year now and still unsure. He's very healthy and comes out to eat every day. Any thoughts?

Also he's in a 35 long aquarium with 3 other normal striped Kuhli's

 

[coriesinhawaii]

I’ve never seen one like that before. He looks like a cross between a regular Kuhli and a black Kuhli. He does have just a few stripe like markings at his head.