I used to have cichlids but after we moved an re-homed my cichlids I decided to setup my 65 gal tank with goldfish. I am wondering if it's ok to put goldfish in my prior cichlid setup? After doing a little bit of research it sounds like the substrate is not appropriate as it is crushed coral and I have lava rock spaghetti Stone and other Coral type Rock for caves that may hurt their fins. Should I empty the tank and start from scratch?