I just read through this whole thread. A ways back you got upset because someone else wanted to take over the sea horses and now you are thinking about selling them? Just trying to give you perspective on your own posts.
They should not be to much more care then any of your other salt water tanks, I say stick with it and just figure out the cycle. Do not worry about trying to raise the fry, just keep at it with the horses. You have the chance to keep some very rare and special animals that many people would never get the chance to do.
You are already at the advantage of having sea horses that eat frozen food, if nothing else that right there would be enough to make me keep at it. Would you honestly rather sell them to someone else who in the end cares for them improperly and ends up killing them?
At least you have shown that you want to care for them, every post I have read shows that. I say stick to it, try the best you can to deal with it, and if nothing else try to stress out less about the little guys. If water changes are to much try doing WC's using the water from your SPS tank, I am sure it is fairly clean and it would help you do less work and save you money. Some people may not advise it because of the potential for pathogens, but then again your horses were WC anyways so what could it hurt at this point.
Keep at it you can do it.
