For a 10 gal
, it should be fine as long as there is enough support under it to prevent bowing.
If your stand is only as big as the tank, then 2 rails spaced 12" apart (the width of the tank) should suffice. But if you are building a big table and putting the tank in the middle, you would not want to use a 1/2" ply & just have support around the perimeter of the top ... the ply will sag under the weight. For a top like that, I would build a grid of rails 12"-16" apart under it for support. Or you can build the top as a torsion box, which would be both strong & light.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.