I don't really know too much on them, but I did a google and they seem really small. Wouldn't that size tank be too big for them? Maybe 9-10 of them would be cool in that big tank? I am going to close off the top of it and take one side of the glass out to put a screen door in for easier cleaning, so feeding them wouldn't be too hard. I'd hate to reach all the way down in that thing to feed and water anything daily.