| the BEST type of wood is a hard hardwood, like oak. But that's extremely expensive. You can get by with a softwood like pine, but spruce would be better (search on google to figure out how to identify spruce in the lumber yard, because spruce/pine/cedar are usually just labeled as "pine"). You will need to bulk up the rails and construction to account for the weaker material.
Use 6 vertical legs (4 corners, plus 2 in the longer span). The vertical legs can be 1.5x1.5", but I would make the cross rails the full 1.5x3". Also, set the upper cross rails on TOP of the vertical supports to minimize the sheer stress on your fasteners (I'm assuming you're not making some nice mortise and tenon joints, lol). Use diagonal brackets (1.5x1.5" if fine) on the sides, rear, and top to brace the frame against twisting.
You can secure the whole thing with deck/wood screws. But countersink them and plug them with dowls to hide them and make it look more like furniture.
now, if you wanted to put paneling on the side to make it into a cabinet, you can just run a groove along the insides of the vertical pieces and slide some plywood in as you're assembling the stand. Or you can screw the plywood to the frame after the fact, but it won't look as nice.
edit: if your aquarium is acryllic, you'll also need to use a THICK piece of plywood (like 1") on the top to support the entire bottom. Glass aquariums only need to be supported around the perimeter. Last edited by Tavel; August 12th, 2008 at 04:19 PM.
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