(Yes, I know their water is low. I cleaned and refilled it after taking this photo.)
Tank toppers are a great way to add extra space and interest to your gerbils home, without the mess of escaped bedding that often occurs with critter trail style cages. They also allow you to mount a water bottle on a different level, and place a food dish on a different level, encouraging shy gerbils to come out into the open to eat. Toys can be hung or snapped to the bars and provide new chew and play options.
Your tank topper should be chosen with the same ideals as a wheel. It should have grid style floors to avoid tail or foot injury, and should be made solely of metal. I purchased mine from Amazon.com.
Warnings & Tips:
Bar biting is when a gerbil obsessively gnaws on the bars of it’s cage. It can cause baldness on the nose and possible damage to the teeth. It is generally a symptom of boredom and can usually be prevented if other chew options are available. Usually. Henry (pictured above) however is a notorious bar biter no matter the toys and chews I provide. The best way to stop this bad habit is to only allow them to have their tank topper every other week. This prevents boredom and is good for their mental health.
If you are breeding your gerbils, only allow your pair to have a tank topper while there are no young present. Newborn gerbils may be placed by their mother under a ramp, where they are in danger of being crushed if you move it unknowingly. “Toddler” gerbils are clumsy and can hurt themselves falling from the highest level. Wait until your babies are of weaning age before allowing them to have access to a tank topper.