Also, that tank is WAY too small for a goldfish. They’re a type of koi, and should ideally be in a pond with natural water flow and not alone (it’s how they were traditionally raised in China and Japan). They can also live for decades and can grow up really big, so if your goldfish dies after six months at the same size you bought it, that’s not a natural “old age” death, you were a horrible owner. /fishrant, how pet goldfish are treated makes my blood boil.