Due to CITES, it is illegal to collect WC specimens and import them. At least it will be in a few months. You will still be able to purchase seahorse, just cb-supposedly CITES will not apply to CB at all. You don't have to feed more then 2 times a day. I feed before work, when I get home. Trained mine to frozen, but occasionally give them live treats. The tanks size should be ok as long as it is bigger then a 20 XH. Thats pretty much the minimum requirement. They are quite interesting, always something new to see. Specially when they give birth, thats a whole new addiction. I've got a whole ton of fry tanks, greenwater tanks, rot tanks. It makes it harder, I've got 4 erectus and 4 of another species I haven't identified. They give birth every 2 weeks.
PS: If those are pics of each one, you've got two very nice looking males. Try adding some color to the tank if you keep them, mine go through color changes depending on mood/whenever they feel like it. I've got some artificial finger corals and they love them. If you go to seahorse.org, rocco has a very nice tank setup. Check in the pics section, the title is "I got mdl barbs", at least thats what I think it is. wow, long ps...