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I've had my 10 gallon freshwater aquarium for a few months. It's developed a brown film on the walls of the aquarium. It's enough to look dingy, but not enough to obscure my view of the aquarium. Is this good or bad? Should I clean the tank? If so, how? I test for ammonia/pH/nitrates/nitrites...

I have a 10 gallon freshwater tank. I've been changing out 2 gallons of water once a week. I usually add enough dechlorinator for 2 gallons into the tap water before adding it to the aquarium. I was reading this article: Guide to Starting a Freshwater Aquarium And in section 14 it says...