Hi, this is my first time keeping any sort of cichlid, although I have plenty of other tanks running. I tried to read as much as I could and use the resources I had. All fish seem to be enjoying the setup, not much agression, as I've counted over 50 definite caves/tunnels and currently only 12 fish. It's a 75gal tank. Is there too much open space or will that be good to have as they grow? I wasn't looking to do an exact biotope, but something that would make my mostly malawi fish thrive. Any thoughts or suggestions appreciated. Thank you.