I'm tentatively planning a rack of aquaria laid out as in this diagram
using a 60 in. W x 72 in. H x 18 in. D Gladiator shelving unit from Home Depot. Obviously, I don't want this toppling over, so I'm worried about stability.
My biggest concern is that the layout is a bit top-heavy, since most of its total weight is in its upper half (above the dotted line).
My second biggest concern is that the weight distribution is asymmetrical: side to side on the top row, but also front to back as I planned for 2.5ers where there was room for them behind the 10s and 16 talls.
At reddit someone recommended that I anchor it to the wall. Is that absolutely necessary? I live with my dad and he's not very supportive of my interest in fishkeeping. He definitely wouldn't like me doing things to the wall. Is there any way I could safely get around that?