I too have been keeping seahorses in a "mixed" 110 gallon tank with some acro, bird's nest, chalice, acans, polyps. I use the small wavebox from Tunze to help maintain good flow without knocking the seahorses around. Seahorses seem to like the flow this creates. I also use G3 skimmer...want to make sure you have plenty of skimming power since seahorses need to be fed at least 2X per day.