Renggis is the house reef to the Berjaya Resort (a luxury resort on Tioman Island) and is visited by many divers and snorkelers every day. There is a policy of compulsory lifejacket wearing to stop snorkelers trying to dive down and touch things. A nearby marine park advises people not to take and touch things from the reef.

Fish: There are many types of fish including highfin rudderfish, the whitecheek monocle bream, some large emperors and groupers as well as schools of blackspot and five-lined snappers. There are also many jacks, clouds of chromis and damsels and mullet fish dive-bombing the sand like vacuum cleaners. There is a school of extremely friendly batfish and a large tuskfish that patrols an area. The behavior patterns of the fish show obvious signs of having become accustomed to humans in the water, and of having been hand-fed by snorkelers. 

Coral: The reef reaches a maximum depth of 10m and varies in landscape largely. The north and east side consist mostly of a boulder substrate with encrusting, massive and table corals whereas the south and east side have large fields of Acropora spp, Porites massive and digitate life forms, Montipora, Synarea and in smaller quantities Merulina spp, Hydnophora spp. and Pavona spp. The coverage of coral was also impressive, apart from the south side where there is a lot of sandy rubble and one 12m patch on the NE of algae-covered rubble. There are 3 massive Porites boulders in the sandy area to the south. There is a fairly consistent and strong NNE to SSW current bringing sediment with it due to the SW monsoonal currents bringing water from the mainland. The corals closer to the sandy bottom have more signs of damage from excess sedimentation.

Invetebrates: There are many crown of thorns, especially on bleached corals, mainly Acropra spp.  There is a huge number and variety of sea urchins scattered throughout the reef site (especially Diadema) mainly in the sandy patches. The southern side of the island is home to five black tipped reef sharks and turtles also make their leisurely appearance in this area making this small island reef especially vibrant. We spoke to a local dive operator who told us that this reef has rejuvenated in just two years from an excess of fishing and destructive methods. This adds a note of hope for the ability of coral reefs to restore themselves.