do most stands have an open top? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 02-26-2013, 03:55 PM Thread Starter
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do most stands have an open top?

I have a 55 gallon tank that came with a stand. The stand has an open top and that just makes me nervous- The tank will be over 600 lbs. when it's full of water and I'm afraid of it sagging in the middle. Is that a possibility? Would it be a bad idea to just attach a solid piece of wood to the top? Or am I worrying too much?
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post #2 of 5 (permalink) Old 02-26-2013, 03:58 PM
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Most all stands have an open top other than rimless tank stands.
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post #3 of 5 (permalink) Old 02-26-2013, 04:01 PM
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If the tank has a perimeter reinforcement ring built in on the bottom (wood or plastic), then that perimeter takes the load. The center does not need to be supported because the perimeter part transfers the load into the sides of the tank, which have a higher area moment of inertia than the bottom due to the geometry, and therefore can withstand a higher loading. If the tank is not bound around the bottom edge, then you need to support the entire bottom of the tank as it is a load bearing surface without that perimeter reinforcement.

Last edited by Indychus; 02-26-2013 at 04:40 PM. Reason: changed "moment of inertia" to "area moment of inertia"
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post #4 of 5 (permalink) Old 02-26-2013, 05:29 PM
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If your tank has a plastic rim around the bottom, no part of the glass should ever touch the stand if it was solid. If your glass is bowing to the point where it would touch the stand, you better prepare a mop.
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post #5 of 5 (permalink) Old 02-26-2013, 05:35 PM
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Glass tanks are only supported along the outside perimeter. Although it may weigh 600 lbs that's over the entire bottom not just the middle. As much as I hate wood stands I generally would put a wood top on it just for structural integrity of the stand itself and to prevent twisting, racking, forces. It won't touch the glass.

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