Whilst I agree with most of the above , I had most success keeping my Malawi tank VERY well stocked to say the least . Set ups as above with loads of white tufa rock providing endless caves and cavities .
Check out the photo below ... A zoo's tank I understand ....
https://www.google.co.uk/search?q=ma...2LJ62S9DeDM%3A
http://cdn.playbuzz.com/cdn/4eb9670d...028993e1d1.jpg