how would i change the gravel in my fish tank with out killing my oscae. he is about 7 inches long, but he is a messy eater and food and glunk is on the bottom, i would like to chnage my gravel, but i have no dea how to. do you save some of the water from the tank, what would be a good idea to put it in. my tap water is hard and it took me a while to get my bio filter going. i have a 55 gallon tank. Thanks in advanced!
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