Go with the RR for sure. I have a corner 40 gallon Oceanic my horses are in. 10 gallon sump is all I need for my skimmer and heater. This keeps the surface crysstal clear,hides the equimpment,and adds more volume which keeps your water more stable. The flow is really up to you. 3 - 5 times turnover is reccommended for seahorse tanks. I go alot more than that to eliminate dead spots.
