I have no idea what you're talking about. If a fish can't turn in a tank too small it will develop a spinal deformity. If the tank is too shallow it's tail will scrape the bottom as it tries to feed. Eventually it has to bend it's whole body to reach the surface with it's mouth. Not to mention the whole enlarged organs in stunted body thing. I've seen this working at a pet store plenty of "experts" would drop off their S and C shaped "babies" to pick up more victims to destroy slowly. They've been keeping fish for 20 years and obviously know their business. I hated selling RTC's, aro's irridescents, pacu's, umbee, dovii, giant gouramy aquatic turtles ect. because few people have the facilities to house them responsibly. If you have the space go for it. If you don't -there are other stock options suitable for what you have to work with. Lungfish for example don't have the same space requirements as most monsters but still need room to turn Big fish= big tank PERIOD