I agree. Although the LFS I buy from is a very good one, the manager has advised more than once that new shipments of their Africans, especially Aulonocara, are often times juiced.
I've bought numerous Peacocks from that store whose colors quickly faded, but eventually returned to normal coloration after many months. No health issues.
Until the Fuscos, no other Haps or Mbuna bought there showed any signs of being juiced.
The Fuscos have since more than doubled their size. The more dominant one has a solid blue sheen. The other Fusco exhibits a redish camo pattern. There have been no health issues. Both Fuscos dominate their particular rock located at either end of the tank.