So I believe that that fish is in a fairly large category of mbuna that are commonly referred to as "zebra" cichlids. They are classified in in the Metriaclima or Maylandia genus depending on your source. So he is likely a "Blue Zebra". If you google images of Blue Zebra cichlids, you will see that this group encompasses are large variety of both color morphs and species.
"Listen to some of these guys talk, and it's like they were born from their momma's belly with a fishkeeping encyclopedia in one hand and an API kit in the other" (unrevealed).
Nice looking fish!! And mine dig all the time I have pool filter sand. The first time I set up my rock work it was resting on 3" of sand and they dug it all out from underneath. Luckily I had them set up pretty good and no fish were crushed. When I reorganized the rocks the next time I moved a lot of the sand out of that area so they would be practically sitting on the bottom this has helped but they still dig an move them some. I know 1 thing you have to watch out for if you are using large rocks is that they don't fall and crack the tank. All mine are relatively small though.
I just cleaned my tank yesterday and he already dug the hole in the first picture. He is my main digger but the rest of them do it some to. A lot of it has to do with clearing out a spot to spawn from what I have read. It's an all male tank though maybe I should let him know he is wasting his time lol.