Review on 🐠 Coral Feeder SPS HPS Feeder, Long Acrylic Marine Fish and Reef Coral Aquarium Syringe - Accurate Liquid Fertilizer Dispenser for Coral, Anemones, Eels, Lionfish and More Organisms (2 Pack) by Phil Casey

They are primarily sold to feed your corals or fish such as gobies etc and are not intended to remove detritus so don't know why some reviewers are giving negative ratings, if you look forward to using them to clean up the trash - I guess you can't read the description. Yes, he casually mentions that you can use it to clear small patches of debris in hard-to-reach places, and you can, but it's meant to be used as a target feed. On the other hand, both included in this "package" work well. If you need a little more suction power, you can attach a bulb to the tube. When used as directed, it works well.