Dave is right. The cost of a Goni is lower compared to many other similarly colored corals and can be sold fast. It would be unusual for a LFS to have the same one in stock for long periods since they are for sale. Waterpumps use impellers so I do not know how a large system can run without one. Air pumps do not use impellers nor do lift pumps but I have not seen a lift pump on an aquarium.
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