Welcome, the short answer is nope, its no good at all send it back. Clearsil are the cheapest tanks about, have a look in your local fish shop to see what offers they have. Also look on freecycle, gumtree or ebay to pick up a bargain. The bigger the better really as you have more room to move if things go wrong. Good to see you're doing the research, once you get your tank do a fishless cycle and get a good liquid test kit, then we can recommend some fish that are suitable for your water
I wouldn't medicate but do daily water changes of 20% and if you can get some amquel that will help. You've got a good test kit there but you do need to shake the tubes vigorously for the full time to get the correct reading.