I went on a night dive with Tulu and 3 other divers and it was fantastic! Although there were a bunch of other boats in the area, we didn't encounter the divers underwater until we headed back to the boat. I've never seen so many HUGE eels before, octopus, etc. I guess it just depends on when and who you go with. Tulu is like another fish himself and he ALWAYS manages to find things us touristas would miss!