Not the GP, but I've moved from bi-weekly diving in South Florida and the Keys in the mid to late 90's, to once every couple of years for this reason, among oth

Not the GP, but I've moved from bi-weekly diving in South Florida and the Keys in the mid to late 90's, to once every couple of years for this reason, among others. Even then, you could see the difference in the John Pennekamp State Park reefs from when I first snorkeled them in the 1970's.