Avoid metal wheels with mice, rats and gerbils, as their long tails tend to get caught in the slats, which could lead to serious injuries. Plastic wheels are safer. There are a variety of connectable tunnels and tubes to make mazes for your pet s enjoyment. These toys are fine, but are sure not to build them up too high in the aquarium that the animals will be able to climb on top of them and escape. They can easily chew through the screen cover if their hearts are set on making a break for it.
Males together tend to fight.
They all have a propensity for fighting, but if you must, pair up males. The females of the species can be vicious towards each other. Happiest in pairs, they rarely fight. Any same sex pair is fine.