沉木可以降低水质硬度和PH，是忽悠还是确有其事？拿来4种沉木来进行测试 #我可要动手了#
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一直看到有商家宣传沉木的各种神奇功效，也有不少小伙伴疑惑。具体数值还真没什么人研究过，今天我们就做一回吃螃蟹的人。
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