FW puffers are also toxic?
Amazons are a whole load of work on their own…
Schoutodini come from the same spot as dels, so if I had to pick a puffer that’s the one I’d go with. But mixing puffs and bichirs probably isn’t the best idea (nobody wants their poly getting a nice toxic meal).
Most loaches eat snails, but do have barbs that can get caught in sparky’s throat.
I’d say assassin snails are your best bet. They do as their name implies.