I'm a bit late to this thread. As mentioned above, this doesn't work for a fish QT. You can, however, make a coral/invert QT into a "mini display" of sorts.
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Thank you! It's definitely not a thick mat, although as you say, for a 15 gallon this might be ok... One thing that's extremely impressive so far is how quiet it is. I do not hear it at all! Very impressive. I think the water flow is too low though (130 GPH).Congrats! Depending on the sales bundle, the mat that came with yours might be the extremely thin one; adequate, but if you want a more generous cushion, their thicker cut to size is available. (Not as crucial on just the 15-gallon, as say a 150-gallon!) Please enjoy the tank, and keep photos coming.