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Do you guys actually use real razor blades to scrape the tank? I always figured it was bad to put metal in the tank water.
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I read a study (sorry can't remember where) that indicated that small amounts of rust aren't as bad as we all think for an aquarium. When my lights fell into my tank, my skimmer pulled out rust colored skimmate for days. I only did a couple of small water changes for PH purposes, and nothing died.