No no, Sana, read the links.

You still do partial water changes every 2 weeks. At that time, you change the filter. So you have to keep a supply of filters.

You need something to neutralize your tap water, you can't just put tap water in a bucket and add it to the tank. I use Cycle, but there are other products out there.

The strata is typically small "gravel" colored rocks. Yes, goldfish are very messy fish. You will need a strata cleaner, as a lot of fish poop will just sink into the gravel. The cleaner works by pulling the junk up out of the gravel. Mine is a tube with a large nozzle at one end. It is not electric, no batteries. You make sure the tube goes in to a bucket that is lower than the tank and it will act like suction