Well Crystal Bay and Manta point are the same boat ride.
We went to Manta Bay 1st and watched the Manta’s swoop over a seamount and some stopped for a cleaning. Probably more action than I’ve seen anywhere else.
At Crystal Bay the water wasn’t crystal clear and despite DM briefings tourist from another boat chased the Mola Mola away and then giggled about it :(
Both sites were cooler than the other dives around Bali so you might want to add a vest to your kit.
Whale sharks are seasonal so you will need to time this right, they were never there when I was .