The fact that you kept a saltwater aquarium so young is exceptional, regardless of WHAT you kept in it.
Yes, there is a lot of controversy on WC vs CB vs TB seahorses, especially since they CAN be tank bred. I have both WC and CB but have never successfully kept tank bred. It seems strange but the tank bred with wild caught parents seem to be the hardest to keep alive through normal life expectancies.
What has kept you from starting a ceph tank? I didn't even know an octopus COULD be kept in a tank until I found TONMO last year. Then it was a matter of affording the life support system ;>). Expecially after we had just started building out our primary reef (which took over a year in the planning and paying for). If my son had not decided to consolidate his tanks, we probably would still just be reading about octopuses. Now if Trapper will just decide we are safe to be around!
I was curious about your hudsonius. I have read A LOT about seahorses and have kept several differ species but had never hear of hudsonius. The size and now your additional info on success without really knowing what to do suggested Erectus (they are probably the most hardy on this contenent) but it took me a while to find the cross reference. Apparently the Erectus found in NY were originally called hudsonius (and actually wintered in the Husdson river - hence the name) but are now classified as Erectus. I have 1 captive bred, and three wild caught and all are very different. One even has a completely different pattern (somewhat unusual) and does not have the typical "lines" of the "lined" seahorse. My cb is from the Baltimore area and some think it is a different subspecies. Two of mine are from the FL keys and the fourth (most colorful and my oldest) is from an unknown origin.