Can help me identify the fish?

[Ruuzha]

Hello guys,
I need you to help me to identifyone fish. We were diving in Thailand in Koh Samet to be more specific. It was in the shallow in warm water about 1m deep. The fish was about 30cm/1ft long. Grey color with yellow segments and big eyes. Fish had big square almost box head. Side shape was like a wedge from big head to thin tail. My wife think it had yellow fins but I'm not sure.
Thanks for help

 

[Colin_T]

post a picture of the fish otherwise there is no chance of identifying it

 

[FallenPepper]

Sounds like a bichir but yeah need pics

 

[Ruuzha]

I try to take photo tomorrow if I could find it again. But via Google I think it was some kind of boxfish. It's most similar yet