That's absolutely one of my pet peeves: not having enough room to get into the lower tanks. When I built my double 75 stand I put the top 75 pretty high up so that I could get any net or aquascaping décor into the bottom tank. I have to grab the step stool to get in the top tank, but that's easy compared to the nightmare of trying to net a fish and get it out of a bottom tank with no clearance.