I would suggest that you book with a dive centre who will give you a personal guide, so that you get the best shots of the marvelous critters to be found here. That way you get plenty of time to perfect your shots, plus the chance to learn the dive sites with local knowledge.
Many dive centres to choose from in Tulamben; I recommend the guys at Tulamben Wreck Divers.
Happy, safe diving.
2nd the recommendation for TWD... They have unlimited diving package at US$115 per day... Dive Bali with Tulamben Wreck Divers - Bali Diving - Special Dive Packages If u do the dawn dive plus the night dive, I think u can easily get 5 dives in...
A guide will also steady u when you want to do macro photography in the current... ;-)