Stand has around 2mm gap in corner - The Planted Tank Forum
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post #1 of 10 (permalink) Old 05-22-2018, 05:45 PM Thread Starter
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Stand has around 2mm gap in corner

Almost finished building a stand for my 75 gallon aquarium, but there's a 2mm gap between the plywood and aquarium on one corner.

Would a layer of foam be enough to fix the gap, or should I remove the top and use some shims to fix the gap?

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post #2 of 10 (permalink) Old 05-22-2018, 07:35 PM
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Would a layer of foam be enough to fix the gap, or should I remove the top and use some shims to fix the gap?

I'd say either option would work fine. I might even just fill it up and hope for the best!.....but I cant in good conscience recommend someone else try that! Theres a chance the tank might settle a bit down "into" the plywood bottom and might make that gap disappear.

Is the plywood screwed down into the stand's frame? You might be able to back a screw out a tiny bit just to see if that does the trick too.

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post #3 of 10 (permalink) Old 05-22-2018, 09:01 PM
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How thick is that top ? It looks like its not much thicker then the glass ? I would use a least 3/4 " thick top for a 75
 
post #4 of 10 (permalink) Old 05-22-2018, 10:04 PM Thread Starter
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How thick is that top ? It looks like its not much thicker then the glass ? I would use a least 3/4 " thick top for a 75
I think it's just 1/4" (had a couple spare sheets in the garage) the stand is made from 2x4's. If I removed the top, the aquarium would be sitting on the 2x4's, so the plywood is just for cosmetic purposes.

Don't have a picture of it unpainted, but it's like this but with a center support in the front and back. https://cflas.org/2014/03/03/build-y...quarium-stand/


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I'd say either option would work fine. I might even just fill it up and hope for the best!.....but I cant in good conscience recommend someone else try that! Theres a chance the tank might settle a bit down "into" the plywood bottom and might make that gap disappear.

Is the plywood screwed down into the stand's frame? You might be able to back a screw out a tiny bit just to see if that does the trick too.
The plywood screwed down with a couple 1 inch wood screws (was thinking of just gluing it to the stand)

I ended up buying a sheet of Styrofoam to stick under the aquarium. The styrofoam look doesn't bother me, I was going to put a trim around the top anyways.
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post #5 of 10 (permalink) Old 05-22-2018, 10:36 PM
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Only the outer edges of a tank are supportive.
Personally would shim it a bit..
Then use some foam..

always preferred thicker tops though..

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post #6 of 10 (permalink) Old 05-23-2018, 05:45 PM
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The top thickness isn't really too important as it is likely to bend down to the underlying support even if 3.4 or more. But that support underneath does need to be level at all four corners and this is not. I would not want to add a filled tank on this stand as it will be putting a constant twist on the tank bottom glass and that can often lead to it cracking. Foam underneath may simply be a "feel good" solution as it certainly has no structural value.
It may last six months and then suddenly dump the entire tank water in the floor. I simply do not take that sort of risk when I see them in advance.
I would not use this stand until the support frame is corrected.
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post #7 of 10 (permalink) Old 05-24-2018, 02:54 AM
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post #8 of 10 (permalink) Old 05-26-2018, 07:39 PM Thread Starter
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The foam reduced the gap a little, but not enough. Took the top off, made it level and put it back together. No gap, added the foam just because.
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post #9 of 10 (permalink) Old 05-28-2018, 02:31 AM
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The foam reduced the gap a little, but not enough. Took the top off, made it level and put it back together. No gap, added the foam just because.
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post #10 of 10 (permalink) Old 05-28-2018, 04:42 PM
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The foam reduced the gap a little, but not enough. Took the top off, made it level and put it back together. No gap, added the foam just because.
Good call as it does fully solve the problem and that leaves you much better off in the long run. I would not want to go for long knowing I had a potential tank bursat in the house. Do i rush home every day to see if it has happened or just not go home in case it has??
Foam is often mentioned but that needs some thought on what foam can and can't do. Assuming the bottom lip on the tank is straight and uniform and we don't want that to change, will leave that portion setting down on the foam and uniform all around. Foam won't help to support the glass if the water presses it down! What the foam CAN do is help to ride over any small bumps or bulges in the wood on the top of the stand. If there are small bumps on the stand, these press up into the foam at those points to make the upper surface smoother.

Think of it as a foam camping pad hanging off a cot with you on the pad? Not much help there but it sure does wonders for making it better when you might have a few bumps to level out on the ground.

Got to use the right solution for the right problem, though.
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