There has been some speculaton lately that some rubber leaches some nast chemicals that while not a death sentence for your tank, is still undesirable.
If you do a search on this site, someone posted an article a couple of months back about a group of marine biologists who used t use rubbermaid nins or cans and found that something that was leaching from them was causing major problems in keeping the organisms they were trying to study alive...
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