I'm cycling a reefer 170 24" x 20" x 20"high tank and am thinking about doing seahorses. The tank is in the bedroom visible while laying in bed so I think it horses may make for a nice relaxing view. I already ave a mixed reef and fowlr with nems so this will be something different. I have already decided on BB and have minimal rock work in the display. I would like to have two but have no interest in breeding so I'm wondering if two females or two males would be ok together and would females be preferred over male if kept same sex together or vice versa? Will probably go with captive bred H. erectus since its my first time and from what I have read they are supposed to be fairly hardy Also would the 170 be sufficient size for two with no other stock accept cleanup crew?