It's important to find the perfect item for your aquarium use, so we completely understand if you want to change the item for something more suitable for your needs. Simply write in to us at info@eastoceansg.com with our order number and the items to exchange with, and our team will follow up with you promptly.Kindly note only items with original packaging in brand new condition will be accepted for exchange. You can come back to our physical store to do the exchange or arrange for a exchange at your location. (charges applies, our team will inform you of the charges)