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yes it is saltwater

i have two questions, i am about to purchase a 21 gallon tank, and i am a total beginer. i would like to know what is the rule of thumb when it comes to how many fish per gallon/gallons, my second question is, are their any qualities that need to be put into mind when choseng a location in my...

i am about to purchase a 21 gallon tank, and i have two questions, first of which what is the rule of thumb for the amount f fish you can have per gallon/gallons (ex. 1 fish per 5 gallons), the second of my questions is the location of a tank should have what quealities/ (ex. little to none...