Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Penn Plax Finding Dory Betta Tank Kit, 0.5 Gallon
Product description: This finding dory 0.5 gallon betta tank kit is based on the long awaited Disney sequel. Tank includes fun background and stickers. Fun for all ages.
Product feature: Includes background, Stickers included, Water release tank
Product price: $7.76
Product brand: Penn Plax
Target attributes: Tank Size
Answer: attribute: tank size
value: None
source: None