I have a pair of Reidi in a 55 gallon, not erectus as Cel has stated. But I can't expect you to remember everything.
First, which ever species you get, make sure they are CB. These will (or should) be on frozen mysis shrimp already. Everyone says not to feed brine...but I have found the occassional feeding of LIVE brine shrimp is ok.....plus it is fun to watch the seahorses chase and hunt them. Be sure to soak what ever food you feed in selcon for 24 hours before feeding...it will inhance their immune system and over all health.
Everyone says the seahorses can't compete for food with other fish.......I tend to disagree from experience. The captive bred horses are more likely to chase their food aggressively than the wild caught. The wild one's are timid where as the captive bred ones are unaware of the oceanic dangers posed to them, therefore they are more "reckless". Having said that, there is ONE clownfish you could keep with them....I have done it as well as a friend of mine. The perc clown is your best and only option. Get a small one and add him LAST and you will be fine. You could have a few other "pretty" fish as well....my best suggestion is a firefish...
I would NOT use a ten gallon tank unless I was doing dwarves (zostrae. This is the only time I would recommend this to anyone....especially a beginner. I hate that list people keep pulling from the .org. People just pull that list without understanding the additionqal needs of horses and tell anyone here that "Sure seahorses can go in a ten gallon." Whjat is not included on that list is....the seahorse fuscus is very rare....so you buy your ten gallon tank, filtration, and sump and then can't find the species........what do you do with the tank? The other problem, is nitrates in a small tank....feeding twice a day, you WILL have nitrates begin to show up unless you have one good clean up crew.....a ten gallon isn't a sufficient size for the size clean up crew you would need to cover the left over food. I have a 55, I have two horses...I feed two cubes a day...I have minimum 25 n. snails, a choco starfish, four crabs, 3 cleaner clams and a mexican turbo snail.....If you place this clean up crew in a ten gallon tank you are fighting space. They may not add to your bio load...but it would be cramped. The addition of live rock and cleaner clams has kept my nitrates in check...but the sand bed depth needed for the clams and the amount of live rock I have (30 lbs) will not fit addequately in a ten gallon tank. after you add the sand, rock, lants, clean up crew...you will be lucky to have a 6 gallon tank. Many for get this. That is why I applaud Celcanthar every time she says, 29 gallon minimum. Because once you add the decorations, and rock and sand...you are down to 20 gallons roughly due to displacement. The larger the tank. the easier it is to maintain water parameters.
You can mix species.....but multiles of the same species is better.
I wouldn't use a UV......they tend to also kill the harmful bacteria as well as the good.
Seahorses also get different infections than fish...so you will need to read up on those at the .org. They have an extensive list.
