Did the same with my cube tank stand as well as a 29G Biocube stand. Gives you more room for the sump and it looks good. My 215 had corner overflows with drains in the bottom so plumbing behind the tank wasn't an issue.The stand is deeper than the tank. This is to allow the plumbing for the three drains from the back, external over-flow (middle) and the two returns (far left and far right) to go vertically in/out of the stand rather than stick out the back of the stand. With this method, the stand (in my living room) is just a few inches from the wall. It makes it aesthetically more pleasing, IMHO.
I see why it bowed now! I was worried for a minute, but I will be boxing that corner, serves the same function as your added support. I was worried for a minute!Here's a fresh pic showing front beam and one if the 2 pieces of angle-iron. Angle-iron was added due to insufficient rigidity of the front-side of each side-panel.
That is very possible. The beam is screwed to the top panel all the way across. It is not screwed or glued to the side panels. I don't understand the dynamics myself.It bowed because the top was not sitting on top of the side. Just the front "beam", and small style hold up the top.
Instead of the weight just pushing down, it was pushing out and down.
Nope, total trim is only 1/8" for both sides total, I have seen other tanks with it like this, it is more to hide the water line than anything else.The 1/8" is likely on both ends so it would be +1/4" to total glass length and width. My stand has a lip surrounding the sides and front. There is less than a 1/8" gap. The stand was made after receiving the tank so actual measurements were used. I wanted the lip for my own peace-of-mind.
I doubt the filled tank could ever slide, but we do have earthquakes here in CA and I'd swear that I saw the slab floor moving during the 1994 Northridge quake. That one was a "roller" (vs a "shaker") where my bed was flopping/swaying around for seemingly 30 seconds to a minute, and I lived 60 miles away from the epicenter.
There is no lip in the back because the top panel extends out 5" in the back to cover the plumbing, drains and returns, and to give me more real estate underneath. The side lip is chiseled out of the side panel (3/4" thick with about 1/4" removed) leaving a slot for the tank. The slot ends just past the back of the tank so it is "notched" in there.
Adding a 1/2" total each way seems safe to me as a minimum size for the top, if you plan to construct the stand before the tank arrives.
Correct, it doesn't provide support at all. A lot of big tanks don't use the trim for support to prevent bowing.No problem. What you describe sounds more like a thin moulding instead of frame, with no supportive properties.
My tank has a 1/8" frame all the way around, top and bottom. Actually, the plastic, corner pieces are 1/8" and the aluminum frame is less.