Tunze Multi Tube Holder Secures Dosing Lines for only $12.99

[Reef Builders]

The Tunze Multi Tube Holder is an ingenious take on one of the most useful but often overlooked aquarium accessories, the basic dosing line holder. We’ve seen these simple gadgets developed into dozens of different versions which are usually of two different styles, either a clamp-on to the rim of the aquarium, or a magnet…
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[Opus]

Why do all these companies that make things to fit on the side of your tank ignore all the tanks made with plastic rims around them? Are the majority of tanks sold made without a plastic rim? Maybe it is just a marine aquarium thing. I just know I want several things for my tank but I can't use them because they won't fit over the plastic trim.