I have a spare 5.5 Gallon hexagon tank, I would love to stock it with a pea puffer maybe in January, is there anything I would be able to include with the puffer? I've read various things online, some saying that it would be fine to keep shrimp with it, others saying it would be a massacre, but recently I stumbled across dwarf crayfish, would I be able to include one of these in the tank with it, thanks for any suggestions and help.