Hello, I just received a 15 gal. Aqueon column starter tank for father's day. The tank measures 13" x 13" x 19". Up until today my research has always taken me to the 1 inch rule of thumb and I was happy with that and planned my tank around that. However, today I came across an article that states a different rule of thumb for a column tank which completely obliterates my hopes, dreams and my plans. This new rule of thumb says I can have a 1 inch fish in my tank. Is this real. My original plan was to have 4 to 6 dwarf cory cats, 4 to 6 Ember Tetras, 4 to 6 Neon Tetras and one betta or dwarf Gourami. Not to mention live plants. I understand you add a few fish at a time and test to make sure you can still have a stable system. Could use some advice here.