I have kept many many corals with seahorses and many fish as well.
Stay away from corals with stings. Go with slower moving fish that stick to the rock work. IME smaller gobbies like firefish are also great tankmates.
Most corals don't like a jet stream of flow as it is. Neither do seahorses. IME it is possible to have a tank that turns over 20x an hour with seahorses if you break up the flow into many different returns and use spraybars. This will keep the corals happy to.
For lighting I like T5's because the light is intense and cooler burning then PC's IME. Better bang for the buck.
For temps get some fans or a chiller.
It takes some work, you'll need to look into some stuff, but it's doable.