This activity costs 30EGP per person and there are many operators that run glass-bottomed boat trips out to the corral. The trips last one hour.
We went with a company very close to Kanabesh Hotel. One of the highlights of the trip, is that you get to see the largest Brain Corral in the world, and it is huge. There are a number of very colourful fish, and at one point someone gets out and puts some bread on the bottom of the boat, so a number of little fish get very close to you.
It is a good way to spend an hour, and you get a nice view of the Sharm coastline.