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Hi guys, I wanted to get a general opinion on this. I'm looking into making a baffle for my filters to lessen the current flow in my aquarium and I like the system that this aquarist uses: My concern however in using a plastic bottle is the possibility of the plastic deteriorating and releasing toxins into the water over time. I've been reading articles that touch upon this- and some sources say that the levels are negligible, but they speak in terms for human consumption- but what I wonder is can the same be said for goldfish or any fish, really? I'm okay with perhaps having to routinely replace them, but I wonder how often I should be if that's the case? What do you guys think? Or what have you heard in regards? Thanks in advance!