DIET. Hydroid polyps and medusae feed on almost all animals, from plankton, or microscopic plants and animals drifting in water, to fish.

How do hydrozoa eat?

Hydrozoans vary in their feeding habits. Many trap small zooplankton with their tentacles. Some filter suspended particles (such as fish eggs and fecal pellets) from the water column. Some consume phytoplankton.

What will eat Digitate hydroids?

They are difficult to remove but there are some predators that may consume them. For example the Lynx Nudibranch and the Flameback Angel. Manual removal and dosing hydrogen peroxide may work also.