Numerous Moray species can be seen, including the Honeycomb or Reticulated Moray that is frequent at dive locations in Negombo. The outer slopes of coral reefs, ledges, seagrass beds, and caves are preferred habitats for honeycomb moray eels. They seek refuge in deep cracks throughout the day.

The quick Blue Lined Grouper (also known as the Biernacki grouper or blue line sea bass) with stunning dark blue bodies, which darts around searching for the countless young Cardinalfish, is the most frequently seen grouper. Pufferfish, Boxfish, Lionfish, Scorpionfish, and occasionally a pair of Cuttlefish are among the other inhabitants. They flutter about while staring at the divers with magnetic intensity. The twin rock reefs of Thanthirigala are a wonderful place in this location. The beauty which has hidden on these twin rocks is speechless. Seeing coral reefs are beautiful. But these twin rock coral reefs have unique features which words cannot express. It beautifies Thanthirigala. The Indo-Pacific Ocean, the Western and Eastern Atlantic Oceans, and tropical coral reefs are where Hawkfish are born. They are a species of saltwater fish with vivid colors that include white, red, yellow, orange, brown, and black. And you may watch the dancing movements of Hawkfish if you visit thanthirigala. It's beautiful how its colors have shaded in its. They are a favorite among marine aquarium hobbyists because of their giant heads and elongated, thick body and are resilient species that are incredibly resistant to disease and can thrive in various aquarium environments. They exploit the coral reef to ambush prey with a sudden burst of speed and a wide open mouth while protecting themselves from larger predatory animals.