copper can build up because there can be some amount in fish food and that can build up with time.
that's what would worry me the most if I was to go without water change for a long time. Also if one dose daily, there might be some residual from dosing that could build up.
Quote:
Originally Posted by ReefOcean
btw, It wont build up, but it can be depleted. by doing a water change and adding the static 10 more units of element A when 20 are now needed doesn't really help. Next time you need 30, then 40.
It would only make sense that the amount of the secondary trace elements required, is very flexible.
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