Uneven stand surface: Can I fix this?

HI everyone! Over in the aquarium builds section, I've been documenting my process of trying to turn a chair into an a little stand for a 15L (3.8 gal) tank.

I hit a roadblock because it turned out that the base of the chair was covered in glued-on foam that couldn't be easily removed. I managed to pick off most of it, but the surface is still a bit uneven with lots of soft bumps of foam.

Will this cause my tank to break? Is there anything I can do, e.g. put a rigid bit of wood under the actual tank?

ETA: I'm thinking of replacing the bit of wood with a new one, but I have no idea how to select and buy wood that's right for an aquarium. The hardware shop only sells MDF, or huge pieces of structural plywood that are like $50.

 

Wood would work but if the tank is on the chair is the bottom of the tank flush with the bottom of the chair... I'm quite sure foam won't break your tank.

 

The actual chair seat is just a bit of flat wood, not shaped or anything (originally there was a vinyl-covered foam seat on top). Other than the bumps from the foam, it's smooth, flat and very sturdy.

 

Well I don't think it would break but put your tank on it and see if it sits flat... all I can really suggest.. or do a better job at removing the foam if you are that concerned(try running a razor blade )

 

Thanks BGKFan! I used a piece of metal but I didn't think of trying to cut/scrape it with a razor.

All right, so using a razor and a knife I managed to remove more of the foam but there are still lots of little bumps. They feel harder too. I'm not sure if the tank bottom will touch them however, as it's got a frame all around the base so the bottom glass doesn't actually quite touch surfaces I don't think.

 

I don't think it's a problem either way