Most aquarium kept species of seahorses do not grow more than a few inches tall. However, they should be housed in aquariums with large open swimming spaces and sufficient depth. This is because seahorses often swim in vertical motions as well as horizontal ones. Care should also be taken when choosing a filtration system for the seahorse aquarium as they are best housed in tanks with slow water currents. Seahorses are poor swimmers and will often suffer from stress when housed in aquariums with a strong water flows. As far as the tank décor goes, seahorses should be housed in aquariums with plenty of potential ‘anchoring spots’. These include live or plastic plants and corals with thin branches. Seahorses are also fairly sensitive to rapid changes in water parameters. They are easily stressed out by fluctuating water conditions and suffer from weakened immune systems as a result, making them more susceptible to various diseases. Tank bred seahorses are considerably hardier than their wild-caught counterparts, and although significantly more expensive, are much more disease resistant as well.
Feeding wild-caught seahorses can sometimes be a challenge because some specimens will only accept live foods. In fact, it is not uncommon for wild-caught specimens to starve to death in the aquarium when not provided with a constant supply of live food. Tank bred seahorses on the other hand will readily accept frozen foods like mysis shrimp and frozen brine shrimp.