Join Date: Dec 2013
Location: SF Bay Area, California
aluminum in aquarium?
Diana Walstad identifies three major factors affecting metal toxicity in "Ecology of the Planted Aquarium":
1. pH: Toxicity is significantly reduced between 5.5-8, staying in sediment.
2. Water Hardness: Calcium ions in harder water outcompete metals.
3. Dissolved Organic Carbon: According to Waldstad this has the greatest impact. DOCs tend to bind to metals, preventing plants and animals from absorbing them, even in soft acidic waters.
With this in mind it might be tricky to apply to all situations. pH might be on the high side but it is probably neutralized by DOCs. If you're that concerned you could replacing the nail with something else just for the piece of mind, but probably not necessary.
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