If you have a mat under the tank, which it looks like you do, it will likely take care of that slight swelling and relieve the pressure point it might otherwise create. Veneered wood and board products often don't fair well long term around our tanks. What you can do to prevent additional water intrusion it to apply a piece of PVC trim (usually it is air expanded rigid foam) to the edge, overlapping the table edge and foam mat and coming up 1cm or so over the tank bottom. Then, caulk that seam between the tank and the PVC trim, so water will run over the trim and drip down, rather than swelling the wood any further. The PVC trim is impervious to water, so lasts much longer than wood. Hope that helps.
And hope you are hanging in there in Ukraine. We are with you.
Best, Peter