It sounds as though the only solid wood in that thing is those six skimpy little legs; everything is else is paper, chipboard, etc. None of these materials is a good mix with water. In terms of strength, it might stand up to a full load of socks and underwear...maybe...but a tank that will weigh in excess of 800 pounds? Unlikely.
Why don't you go to IKEA and have four 200-pound guys sit on the floor model? Might put things into perspective and save you some grief.