Acrylic warps usually when using undertank heating, because like Chris said, you'll have a large localized temperature differential over the heat pad vs just off the heat pad.

In a heated room, or when heated from above, you should have no problem. Just keep the overhead heater away from the sides. I assume a screen top is on those tanks.

Acrylic does scratch, but I like its insulative properties better than glass, plus it doesn't shatter.

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