As you know, in the valentine update, they added Lwillow Lace(Lovewillow's lace) which is almost same as fishtank when looked at the farmability features. Fishtanks were like 300/1 which made them really hard to trade. With this, you gave us an alternative. This item also could be bfged since it is not a wallpaper nor a block. Thank You!
PS: You can trade this item in BuyLWillow