hi, try not to be in too much of a rush to get your fish in. two weeks is a bit soon. 5 to 6 weeks and you can add water treatments like king british safe water amongst others. it contains bacteria to help cycle your aquarium. aquatic shops are out to sell and you often don't get sound advice. you need people like the members on this forum friendly with experience and not trying to sell you something. when you have gone through the 5 to 6 week period and have tested your water then you can add several fish and progress from there depending on the size of your tank. continue to test and watch your fish. after cycling your tank and adding fish all the basic rules apply. regular partial water changes, don't overfeed,overstocking, varied diet, learn about the type of fish you have, correct tank mates (don't stick a pirahana in with your mollies, lol), the water conditions each fish requires. don't give in because you have lost a couple of fish. i know quite a few people who have quit keeping fish because of loss, too much like hard work or to expensive. all depends on how far you are intending to go. i've lost fish through various reasons like disease but if you've covered all the bases then there is not much you can do except learn from it. or perhaps read a good book on fishkeeping for beginners but nothing beats experience. sorry for the waffle just don't like to see a starter suffer, lol. thanks.