Challenger Bay is an easy dive site and quite rewarding.  We do a mid afternoon dive and a night dive here.  The night dive is really interesting as the trevally will attempt to eat almost anything that we light with our torches. While they are not interested in us, the number of them madly swimming around us and towards what ever our lights shine on is quite daunting, esp as it is night.  Fish that during the day are hard to photograph can be found sleeping under rocks or corals.