Get the biggest tank you can afford so your seahorses can flourish. Consider a second-hand tank if you’re trying to save money. Figure in sand beds and other aquarium features when calculating the size. For example, a 20-inch (50 cm) tank with a 6-inch (15 cm) sand bed only offers your seahorse 14 inches (35 cm) of usable height.

Place the tank in a spot that is either air-conditioned or in a cool part of your home.

Avoid putting too much substrate in your tank. This can cause food to fall into the substrate and create hydrogen sulfite, which is toxic to seahorses. [2] X Research source

Get a filter with a lower water flow. Seahorses can be sensitive to water flow because they are relatively weak swimmers.

Rock Coral Plants Gorgonias[3] X Research source Macro algae

Ask if a local aquarium dealer has live diets available for seahorses. Give this to your seahorse occasionally to boost its nutrition.

Snails Limpets Goby Blenny Clownfish Tangs

Active, moving around Bright active eyes that swivel around searching for food Clear fins Full, round belly

Cloudy eyes Little eye movement White, gray, or inflamed growths Heavy breathing, panting, or coughing Bloating

Let the vet know what specific symptoms your seahorse has, including when they started and what you’ve done to care for your pet.

Brittle or serpent star Lettuce nudibranch Sea cucumbers Sea hares Peppermint or coral-banded shrimp