Hi Daniel. Your profile shows you have very few dives. Nit-picking would not be necessary to anyone with any amount of dive experience to know that hoods are just fine and to know that there are endless debates about gloves (and to a lesser extent knives) on a protected reef. There is no reason to wear a hood but for warmth....at least, I can't think of one.
When I go to Cozumel, I use my hood to prevent my head from butting into the reef or to hold onto sponges for that perfect photo moment. I oftentimes fill it with sand or rocks if I need ballast to prevent a runaway ascent. It's also useful to use as a parachute to slow you down when you descend. I stuff my backup light inside and voila I have a miner's lamp! There are umpteen uses for your hood - it's not just warmth you know... :shocked2: