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i believe the red sea limit is 40m if not tech qualified. have heard stories of major shark action at 47m on elphinstone north plateau. i personally just came back from doing daedalus and st johns itinerary and saw a manta at daedalus and a hammerhead at about 30 metres. if you want to see big things we were instructed to go down to about 25m-30m swim away from the reef but so you could just about it see it and stay there as long as possible. i have never been so disorientated on a dive. but very enjoyable and rewarding. i have been told it's uncommon for hammerheads in september, as it is too hot for them and the best time to see them is may-july, and then november. not sure about the manta time table, but also saw a manta at st johns! i'm not sure how you are going to pack 4 dives in on daedalus, and the other marine parks per day as said before, there is no night diving at these sights. we woke at 5:30am for our first dive at 6:30ish and still only did 3, this is because daedalus is very remote and our crossing took 10-12 hours to get to st johns. (not sure the time to brothers or elphinstone) to sum up.
daedalus = awesome, stay deep (30m) as long as possible out in the blue
elphinstone = north plateau at around 40m
brothers = can't remember the brief i'm afraid.