I guess it all depends on how you built the stand and your preferences. I dont like to struggle with getting stuff out of or into my sump. Just so you know a 60b does not need 2x6 for support 2x4 would be plenty, but if its done its done. I built a stand for 2 125gs the horizontals are 2x6 and all the verticals are 2x4. Overall it works but to leave enough room to work in the bottom one I left 18" between the top of the bottom tank and the bottom of the top horizontal support, this puts the bottom tank on a 2x6 on the floor so its low workable and actually viewing is not terrible the top tank need a step stool to work in thats a pain. The top tank is basically face level with me and its top is roughly at the top of my head which is 6'. I would not do this again the challenges of working in the top tank are more than I want to deal with most days. Being 6' tanks though you need 2x6 4' only need 2x4.