Oh I'm jealous, I love seahorses, I eventually plan to make a tank for them. I'm running a Waterbox 100.3 Reef right now (75g tank). Had a 180g in the past that I built around my Achilles Tang.It’s going to be a stand alone, would love a in the wall tank, but going to make it stand a alone. I am going to be running two sumps for the build. One will be for the skimmer and the other one I think I’m going to do a refugium with mangroves and see horses. But I’ll keep you posted. What type of tank are you running?