Mother-in-law fish tank

My MIL got new equipment for a fish tank and sent me this picture before she sets it up. I'm an 99% certain the organizer she is putting this tank on is from Walmart or IKEA and is made up mostly of particle board.

I asked her how much the furniture is rated to carry. Am I stressing too much? I think the tank is at least 50 gallons.

I also already mentioned the window placement alone causing a headache with algae and temperature fluctuations of the tank.