I have two guppies, Ember and Apollo, and I keep them in an unheated, unfiltered 2.5 gallon tank. I figured the one inch of fish per gallon rule applied, but after reading a little more, I fear I messed up big time. I have an empty 10 gallon tank, all set up and ready, but I had other plans for it. I do NOT want to mistreat my fish, and I will drop my plans and fix the tank into a guppy tank, but CAN they live ok in this tank? i do compulsive 100% water changes on it, and feed them a great, varied diet. If I heated it and put an airstone in it, would this suffice?