i am gonna get a lot of fish and my qt tank is very dirty and was thinking about emptying out my 10 gallon qt tank and filling it up with water from the main tank but i will also change the gravel out.will the fish be okay if i take out all the gravel and empty the tanks water and then fill it up with the main tanks water?just so everyone knows i will NOT mess with the filter i NEVER mess with filters unless i am doing a 10 gallon water change the normal water change amount.we may be getting about a dozen or more fish over the weekend so please reply...