Seahorses have no stomach or teeth. They have a tube that they use to suck in all their food like a vacuum.
They eat pretty much anything small enough to fit through their mouth, which is mostly shrimp, baby fish, and other small animals.
Seahorses sleep or rest with their eyes open. When resting, they tend to cling onto corals using their tails to camouflage and avoid drifting in the ocean while resting.
70% of the oxygen comes from the ocean. Reefs are the most important part of the ocean and without them, marine life would die. No coral reefs, means no oxygen from the ocean.
Seahorses breath through gills Algae living in the coral reef also produces oxygen.