
According to me, it would appear to be a Pseudotropheus Crabro, or P. "chameleo". This is identifying it using a single photo out of the Baensch photo index 1-5, so I could well be mistaken.
Can anyone confirm, or otherwise identify please?

At present he is in a 3 foot tank with 5 Kribs, 2 Blue Acaras and the Zebra Obliquidens.
I think that some rehousing may be required soon ....