Basic needs?
Tank 29g or more.
Temps between 69-74F
Ammonia 0
Nitrite 0
Nitrate I've gone as high as 100,
pH 8-8.4ish
They need things to wrap there tails around and hold onto. I use small branch rock in the tank and plastic chain in QT tanks. I also have various other decoration in the tank they like ie gorgonia, macro algae, powerhead cord.
Aquacultred seahorses should arrive eating frozen mysis, feed twice a day.
They only need enough light to find and eat there food.
I would spend the extra buckets for aquacultured direct from a breeder, otherwise we will be talking about what deworming methods are best, they take months, require there own tank, and are a PITA.
IME clowns are not so good as tankmates, firefish do fine.