Ohh, yours is the post I just replied to the other day about treating for parasites. What state are you in? It's odd that they'd be banned. Can they survive in the local area? That's normally the only reason, but then again I don't know who would release them..
Probably somebody buying on impulse who then experienced "surprising issues with aggression or nipping"
That makes me livid- When somebody chooses to buy puffers or loaches to deal with their pest snail problem. Puffers aren't community fish so that's an almost destined fail. And they try adding a brackish/marine puffer to a FW tank on top of that. And the other one- someone suggests clown loaches. I'd never recommend to anyone unless I knew they were prepared for them full grown.