I was thinking, everyone says the minimum tank size for a pair of SH should be 30 gal. some people have them in 10 gallons, sometimes 20, maybe even 50. But i was wondering if it is necessary to have such a large display. Do seahorses need more than 20 gallons to move around in? Is it just concerns about water quality? So what i am wondering is that is a smaller display with a large sump effectively the same as a tank without a sump and a larger main display?