For dwarf seahorses I know it would - I've seen many people successfully raise dwarfs in smaller than 7g tanks, due to their tiny size.
As for anything else, I was posting because I wasn't sure it would work, and to find out if there was something equivalent in size to the dwarfs that might be less difficult to get.
http://www.seahorse.org/library/arti...fKeeping.shtml
They're actually recommended to be in a smaller system due to food concentration and ability to care for them.
So in the end:
*Are there other breeds of SH that would work in a nano system
*Are these breeds less difficult to acquire (and by less difficult, this also means cost wise)
*Are there any small standard breeds that would be comfortable in a nano.
*Is it possible to get a small group of dwarf seahorses in without a cost of $400?
If the answer to all of those is no, that answers my question.
Does that clarify things a bit more?