How to get my cichlids to breed?

I have tried everything...changed gravel to crushed coral, raised temp to @ 82 degrees, water changes weekly, 7.5 ph, feed frozen bloodworms, brine shrimp, & mennos. plenty hiding places between large rocks...what do i need to do to get these lake malawi cichlids to get it on? I have 10 of them in a 55 gallon tank...they are all at least 3" long