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I'm on my second tank of Shell 91 (from Ultra 94) and I haven't noticed the crickets as much as my first tank. The first tank definitely reduced the percentage of the crickets from 90% of the time to maybe 20% but that's just a guess as I honestly haven't paid attention to it as it never really bothered me in the first place. I guess you could say I switched to the Shell 91 as an experiment to see if it really does quiet the crickets, and it does for the most part in my case. YMMV.
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Bryan.
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