If the tank is the exact same size as the sheet of foam in the photo (or slightly smaller)...I'm going to say yes there could be a problem. Since from what I'm seeing...the rear two corners of the tank would not be directly supported by the metal stand. The foam sheet (of course) offers no support at all...just insulation.
I would (minimally) use a thick piece of plywood that completely spans the metal cross-members of the stand...before placing the tank on the stand & filling it.
You also didn't mention the dimensions & volume of the tank.