I bought it for my daughter's fish and she liked it. We took the advice in another review and soaked the lock in baking soda and water. However, shortly after the castle was placed in the aquarium, the fish got sick and slept all the time, not eating anything and hiding a lot. Almost immediately after we removed the sluice the fish began to behave much better, immediately taking to the air and beginning to swim and feed. The small glass stones that the lock came with are fine.
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