Sorry for the delay in responding. Life has been a bit hectic lately.
Here is the link to the Delux Sea Ranch which can be purchased from OR
I like the standard retangular shaped tank for seahorses.Most sizes come in a tall version. If given they will definitely use horizontal space. A wet dry filter with a skimmer and sump is ideal. UV is also nice.
I like to use RO water because it has many of the minerals that contribute to algae blooms filtered out.
Pete Giwojna has posted a chapter from his book on setting up a seahorse system. You can find it along with quite a bit of additional information in this thread…..