thats the first thing i saw too
Your mileage may very I suppose, but I'm already seeing that bottom shelf bowed with what appears to be an empty tank.
Thanks for the comments!
The bowing is due to the camera bowing distortion. If you look behind, everything else is bowed outwards.
The basement is not completely level, it's actually tilted towards a drain in the middle. The rack is actually slightly twisted, but it should be fixed after I tighten the bolts and level the rack.
I'm thinking of reinforcing the shelves with extra bracing. Right now, only the bottom two shelves are reinforced. When I talked to the store employees at the place (Rotblotts') about putting aquariums on the rack, they said it could handle the weight and recommended adding 8 bracers (2 alternating on each shelf). I think I'll add more bracers later on.
Not sure if I should nail it against the wall--I don't know if the wooden wall posts are reinforced or not, it just might be used for holding up drywall on the other side.
Also, I might not use the 20g high. I'm giving it away to my friend, so I might drop the upper shelves to about 20" spacing and get all 10-15g or less.
Edit: Oh yeah, I got this idea off a couple of other PT members' racks. I saw MacMellan's thread hoping for some cleavage but didn't end up disappointed.
As well, some quick calculations, if I put two 10gs on each shelf, it's be about 170 pounds of water weight. Being conservative, if each rack were 200 pounds, and I have 3 shelves each with 2x 10gs, it'd be 600 pounds of weight. I think the rack could safely support that. Now I need to calculate the rack load capacity without literally testing it.