I'm new-ish to the fish world here! We bought a 10 gal. about a year ago and upgraded that to a 25 gal 6 months ago. Now we've set up a 75 gal and am starting to get it stocked. So far, we have 5 giant danios, 5 zebra danios, 2 albino cory, and 5 tin foil barbs... I'm contemplating whether I...