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Interesting observation while working with some rock. I had taken some rock out of my tank and put it in my sump, then was ready to remove it alltogether. I dropped it strait into a saltwater bath and dosed a high dose of LaCL to soak up any phosphates in the water to help leach any phosphate out of the rock as fast as I could. I did it in saltwater as I wanted too re-use the rock immediately and not "Kill It" just use high doses of LaCL to leach phosphate as fast as possible. After a few treatments I noticed the Vermetid snails stopped webbing when dosing LaCL. A little further reading confirmed many people reporting the death of most filter feeders when there was high levels of sustained LaCL precipitate. Since I dosed heavily and frequently I would propose repeated heavy exposure to LaCL precipitate may have negative effects on these snails.
Just an observation.
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