Yes that is normal. Algae may grow, that is also normal, red slimy stuff (Cyano) may grow, that is normal. Your ammonia is not normal and should always be zero before you add any animals. You don't need to change water yet. Use your money to go out to dinner and have a nice glass of wine to calm down. Your tank is fine and it will mature after it goes through those things I mentioned. When you start changing water it depends on what and how much livestock you have in there so out of the million people on here, thats how many suggestions you will get so I won't add another one. Keep reading and try to learn from people who have had a successful tank for a number of years and didn't start it last Tuesday. There are plenty of very good aquarists on here. All you have to do is sort through all the information because there is no censor and anyone can post anything no matter how bizare. Use comon sence. Your tank is fine now.