I'm pretty sure this has been brought up before, but I was wondering if you have a shoal of pygos what can be the max size between the smallest and largest fish? Can I have a 3" pygo with a 6" or will the 3" just end up getting picked on and eventually devoured? Ultimately, I want to have a shoal of mixed pygos except for cariba (I have some already in my other tank, 125 gallon). Pirayas, Terns, Super Reds. What do you think?