I ordered these without considering the size of the tower tube they run through in the system under the gravel in my 60 gallon. Aquarium with freshwater fish. They are much larger in girth and the place where you attach the channel to the stones is larger but look at the original stones, they have a rubber tube, take it off the old stone and put it on the bigger, and the problem is solved, and they really create some bubbles that work very well. I will see if there is a difference in water conditions but I can opt out at any time if necessary.
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