Out of curiousity, if puffers are notorious nippers, would they make bad tank mates for lionfish??For the most part, the miles is a variety of volitan lion, depending on where you shop you may find the volitan, miles, and russells interchangeable. Experienced will find slight differences in markings, tentacle and spike length, body width, and so on; the miles is suppose to be a bit smaller, but in captivity the differences are slight. Their temperament and care would be the same. Coloring may be different as well, but so is the coloring within the true volitan. Check out the coloring on my volitan, he is huge almost a solid foot, they do rarely get this large in captivity, but I spoil the heck out os my pets.
Talking about the difference between a 135 and a 180, think in terms of square footage. Fish like a porcy does not like to be crowded, that's why I have always found them to be notorious nippers.