Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to care for a sandfish skink [title] Get an appropriately sized terrarium. [step] Growing to an average of only 6 inches long, sandfish skinks take up little space in the reptile world. For a single adult skink, use a 10-gallon tank.

Ending1: Add an extra 7 gallons per extra skink. Use a horizontal tank to house them for they don't tend to climb much. Ending2: Once it grows, you'll need an adult tank and 10 gallon tank. The terrarium needs to have at least 4 gallons of water per gallon, which is enough water for the two skinks. Ending3: With larger brine tanks, you may only need 15-20 gallons of space. Young bucks can actually live in another 15 gallon aquarium, with six larger tanks surrounding it. Ending4: It is important to accommodate one skink and one adult. The tank should have spaces that are suited to the reptile's size.

Answer format: ending1/ending2/ending3/ending4