I have an Aqua One Regal 100, with an Aquis CF1200 external filter and twin interpet T5 lighting - one moon blue and one tri plus, The cave in the corner i built myself carving polystyrene and coating in cement. The cave hides the inlet pipe for the filter and a 300W Heater.
Be creative and give the fish an interesting environment to live in.
I have recently changed my setup from tropical fish to a variety malawi cichlids.
Trying out various plants to see which are best with cichlids.