Thanks everyone! I really like these guys and it took me a long time to get a healthy pair. I want to get another pair, but its tricky because they come in so small from the vendor, not much larger than what I'd consider fry.
Adults are around 5". The biggest fry I have are around 2 inches. They're small for their age (3.5 months, the 3rd picture) because they've been very fickle about switching to frozen.
Northstar, if you decide to get seahorses, I wouldn't consider H. comes as a first seahorse. They're somewhat touch. H. erectus is near bullet proof. I happen to have those too if you're looking for any. :)