As you can see I didn't have a huge amount of corals when this pictures was taken, but they seem to be doing well with the flow. I have the 2 gyres set in a master/slave configuration so that they alternate being on giving me a nice ebb and flow. My biggest issue with having them vertical is if I turn the flow up too high I can't keep my sandbed in place. They do still create plenty of surface agitation though.That’s kind of what I was thinking . But curious how the flow is