This isn't an LFS, by your own admission, it's a feed store that happens to have some fish. I think it's an important distinction. I also don't think there's anything wrong with this Lion's current enclosure. Lions are pretty sedentary and don't need much swimming space compared to say, a Tang. From the pic, he has a decent amount of space to maneuver. As someone who worked in and managed a couple actual LFS, I've seen it all and this is not that bad TBH. Not ideal obviously, but definitely not in the realm of animal cruelty IMO.