Hey guys I'm new here! I'm 17 and I've had an aquarium off and on for the past few years. I am only 17 so I don't have alot money to spend and my parents let me do my own thing with the fish tank. I have a 10 gallon tank with a aqua tech 5-15 gallon filter, I've done alot of research and the only thing I don't really understand is testing the water, I have had fish live for over a year in the tank but never have I ever used any sort of chemical to make the water safe. I always changed the water weekly or every 2 weeks and would just let the new water sit in a bucket for 24 hours before adding it. It's worked fine or I have just gotten lucky but I know if I actually knew how to take care of the water my fishies would live longer. Any advice or knowledge back on this would be greatly appreciated!