Looks like a sub-adult male Melanochromis Auratus to me. The colours are not distinctive because he is in the process of changing from yellow to black and they appear somewhat dull during this time.
Ah thank you for clearing that up Ferris. Couldn’t wrap my head round the colour changing thing.
He's a puppy dog just now but I guess he'll get increasingly aggressive then
Hes in a 180ltr with mostly tetras, silver dollars, gouramis and other fish way smaller than him. He contents himself with digging little tunnels which my plec moves into so he goes of to dig another home.
No idea how old he is or how long hes been there as I just got the tank a month ago complete with fish.
I kind of knew what he was but I was hoping I was wrong the colour thing threw me.