This tank would make a perfect riverine pike cichlid tank, not that there's anything wrong w/tropheus & petros. My Xingu 1 pair would think they're in heaven after being housed in their teeny tiny 125 gal. Just sayin'. Or my lents, or Atabapo Reds, or Fires, or well you know how it goes with fish...
Thanks for posting, it's a great tank, and good luck with the petros and trophs.