01-22-2010, 08:56 AM
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Dont' buy anything like this from a pet store, please. Go to you local home improvement store and look for insulating foam. The sell it in 4' x 8' sheets in various thicknesses. Its similar to the foam they make cheap coolers out of. You can get an entire sheet for $10 and it's big enough to supply your foam for several tanks.
Should you do it, yes. "I haven't had a problem yet," is a nice sentiment but I haven't caught tuberculosis yet, doesn't mean I'm gonna go walking into a TB ward and kissing every patient in there. First off, no surface is 100% level, especially when it comes to things like furniture. There will be small dips and rises across the surface. Remember, level just means it's parallel to the ground, not that it's perfectly smooth at all point. Additionally, wood is not a permanent rigid material. Over time it can deform, especially with a large load on it. Now I'm not saying if you don't use foam your tank's gonna leak. Your stand might be incredibly smooth and flat, your tank could just be strong, or it might just not be enough to be a problem.
Look at it this way though, the foam for your average sized tank costs about $2. Unless you can replace your tank, your stock, possibly some equipment, and repair water damaged flooring and stands for less than $2 that makes a layer of foam very cheap insurance.