We suggest a water temperature of 76-78° F (24-26° C) and the optimal pH for captive Diamondback Terrapins seems to be in the 6.8 to 7.0 range. In much of their natural range, Diamondback Terrapins are found in brackish water. Therefore, many keepers add salt to their enclosures. Most keepers feel that Diamondback Terrapins raised in captivity do not require this raised salinity level, but we believe that some aquarium or marine salt helps. Salinity prohibits or greatly reduces the growth of many types of bacteria. We add about one tablespoon per gallon for our Diamondback Terrapins' enclosures both inside and outside.
These turtles love the sun! Basking is an important part of a Diamondback Terrapin's daily routine and sturdy basking sites should be available to babies, juveniles, and adults.