Fixing Flushness Problems With Styrofoam?

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Valued Member
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2 years
I recently made a DIY fish tank stand for my new 20 gallon tank. I was careful to get straight pieces of lumber and precise cuts to make sure everything was square.

The floors in my house are not level, so I went ahead and put notecards (I figure they work the same way as shims. I actually used a wood shim on one of the legs) under the legs to make the tank on top nice and level. I have filled the tank 1/3 full with water and everything looked nice and level, but there was a small gap between the plywood top and the plastic tank bottom--small, but you could see daylight between the tank and the stand (I have a standard 20 gal high glass tank). The corners all rested directly on the stand, but the middle of the long sides had a tiny gap. I went ahead and put styrofoam around the edges, but I'm wondering if this is a bad idea. So my issue isn't about the tank being level, but the top of the tank stand being perfectly flat/flush with the bottom of the tank.


Well Known Member
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3 years
As long as the corners of the tank are touching the touching the stand, it should be okay. I have a 70 gallon and a 29 gallon, both which only have the corners of the tank touching the stand and do not have the front and back sides touching the stand. Both do not have any problems.
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