i'm going to school next fall, and in my room i'm allowed to have a 5 gallon tank. I like to plan ahead, so i've been thinking about a coldwater one. it's only five gallons, and I know that coldwater fish need a lot of air, so could I make that happen? i'd probably get a goldfish, and some aquatic plants. but do you have any specific tips about coldwater? I know the basic stuff like cycling and everything. just not anything unique to coldwater tanks(example, do I need to do anything to make it cold? drop in ice cubes or something?). help please. and I'll be sure to reserch more on coldwater tanks too.