Realistically, what "black" ray combinations can I put in there having a width limiting foot print of two feet? I am not worried about filtration in this tank. Can I realistically get standard Leo's? or stick to the smaller black diamonds and hybrid combinations? I get a lot of differing views. Due to tank location I cannot get a 3 or 4 foot width in this area. Any help is appreciated. Am I doomed in my dreams? If I did Leos, how long would it be before the tank is limiting to their growth and movements as a guess?