have had the tank up and running with 6 fish in it for about 3 weeks now? What are some maintence things that need done. I know about changing about 20% water, and the filter insert every month. What about vacuuming the gravel (thinking about getting a hagan marina easy vacuum), and what about cleaning the walls of the aquarium ( a friend told me to get a mag float cleaner for this). Now if the aquaruim walls dont look dirty should I still do them? Also ?need to know some of the better quality test kits? thanks for your time.