Depends where you go innit. Places like the Bahamas are super clear waters and warm, also shallow for the most part, between 15-40 feet and mainly reefs at 15-30 feet. Visibility is amazing and most things are tiny but cool. Biggest thing you’ll get unless you go further out are moray’s (shy asf), Very chill Reef Sharks (4-8 footers) and the occasional stingray (also pretty shy and nice, cool creatures)