I haven't set up the aquarium I'll be using them in yet, but I've researched the product and will tell you all I can about tubes. The thickness of the glass is more than enough for strength. I really like that these tubes use a pair of suction cups instead of just one and the pins that hold the suction cups are precisely shaped and aligned and the suction cups are secure. The suction cups hold up very well, at least while they're new. The cutouts at the intake end are well shaped and attractive. On the other hand there are some very tiny scratches on the glass, possibly from shipping. However, I have to get the tubes a few inches from my face to see them, and even then they are difficult to see. When pipes are in use I don't think anyone will ever notice they are there. Overall, this appears to be a well-made product. If they're all so well done, I don't think anyone will be disappointed with them.
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