Seahorses can be easily housed in acrylic or glass home aquariums.
As a guide, use a ≥30 gallon aquarium for two seahorses, a ≥50 gallon tank for four seahorses and a ≥75 tank for six seahorses. Because seahorses swim upright, use a tall aquarium at least 18 inches high.
Biocube aquariums and vertical display aquariums work well. Aquarium kits can be purchased as an easy way to start a seahorse tank. Custom aquariums can also be designed to enhance the display of seahorses.