The difference between tiger-head goldfish and Lanshou goldfish:

1. Head-to-body ratio: Tiger-head goldfish is 1:1 to 1:1.5, while Lanshou goldfish is 1:2.

2. Appearance: The tiger head goldfish has a relatively flat back and is more responsive, while the Lanshou goldfish has a higher back and a round belly.

3. Mouth: The mouth of tiger head goldfish is concave, while the mouth of Lanshou goldfish is protruding.

4. Back arch and caudal fin: Lanshou's back arch has a large arc, the two middle caudal fins are upturned, and the tiger's head is relatively straight.

Lanshou and tiger goldfish can be raised together because they both have similar water quality requirements and their requirements for the breeding environment are not much different, so it is okay to raise them together and enjoy them. However, when they are kept together, they may cross and produce hybrid goldfish. If you are concerned about this situation, it is best to keep them separately.