I'm getting a 75 gallon tank from a friend and i'm just not sure what I should put in it. In my 12 gallon I have 2 otocinclus, 3 corydoras, 1 swordtail, 1 balloon molly, and 2 fancy guppies. All these would go into it. What would you guys get if you had a 75 gallon (4ft) tank?