Baby Seahorse

[rayjay]

You can check the links at the bottom of "My Thoughts...." link in my signature.
Very basically, it's best to keep them in pairs or more but you need minimum 29g tank for the first pair with an additional 15g for each additional pair.
Best to keep the tank between 68° and 74° for health reasons.
Requires water to be kept cleaner than a reef tank, again for health reasons, and they dirty the water quickly as they don't eat all pieces of food, and, when they snick their food they masticate it and pass particulate matter out through the gills that sometimes looks like a cloud but is further degrading water quality.
You can't test for this "dirty" water, but in time it allows nasty bacteria like vibriosis types to take over with damage/deaths to seahorses so extreme husbandry is required for the long term survival which should be 5 yrs and more.