Extensor Foot Tendons. In the foot diagram below, the main tendons on the top of the foot are labeled. The group of tendons are called the extensor tendons and are responsible for elevating the toes and flexing the ankle up (dorsiflexion).
Dwarf puffers are quite hardy and will tolerate varying water conditions but obviously will do best, as with any fish, in optimum water conditions. They do best at temperatures of 80/26 degrees with a ph of at least 7.
Although they only grow to around six inches in length as adults, the minimum tank size for a single puffer is 30 gallons. However, 55 gallons is preferred and will allow your fish optimal room for swimming and exploring. Green Spotted Puffers kept in aquariums require brackish water through most of their lives. In wild conditions they start in freshwater, and often migrate to marine conditions as adults. As far as you are concerned, this means you are likely going to have to increase the salinity of your tank water as your puffer ages.