I'm going to be diving in SE Florida and/or Keys in week. I'm traveling with a group, some of whom are novice divers with health issues. So, we have to stay shallow and avoid current. We are planning to go to the Blue Heron Bridge and into the Keys. I understand the the northern Keys are badly damaged by a disease, so I would like to find spots that are relatively healthy, but also shallow. Can anyone recommend dive sites and shops that you would recommend?