Mnemba Island is edged by a powdery white sand slope interspersed with small outcrops of rock. Some of these would have once been hard coral bommies and, although they have died back, where there is regrowth the fish life is extremely good.
A little deeper, there is a small wall covered in younger hard corals and colourful sponges. We found it was a good idea to stop and study all the small outcrops as many of them were homes for well-camouflaged creatures. We found a lot of leaffish, brightly coloured flatworms and these two giant frogfish that we almost missed anyway – we were turning away to look at a small turtle but the divemaster pulled as back to photograph them.