Hi, welcome to r2r!!! I wrote the article on Intro to Keeping Seahorses. There is a bunch of great info in it. On of the biggest issues with keeping seahorses is the temperature. It is very important to keep the tank cooler than a typical tank. I recommend 72 for most horses. Depending on the type of horses, you may have to keep it cooler. Also, you have to be very mindful of the other inhabitants in the tank. Seahorses should not be kept with aggressive fish, inverts or corals. I would recommend starting with a fish first and get the hang of monitoring the water quality first. When it is time to get the horses make sure to get captive bred horses that are trained to eat mysis. Good luck!!!