PEVINE11;4473641; said:look at it this way
%100 pure water evaporates out of our tanks every day. We add new water to top off and relplace the evaporation. If there are any contaminants in that top off water, it will continually be added and concentrated as %100 pure water evaporates off and new top off water WITH whatever contaminants is added. Do that math on that, excesses of things we do not want in our water inevitable WILL accumulate in the tank if they are present in our top off/make up water.
Its hard to back off when such erroneous information is getting posted. I now understand why you think nitrates are caused by crushed coral.
If you CHANGED your water and did gravel vacs rather than just top off evaporative water loss there would be no accumulation and no nitrate problems. Basic tank maintenance avoids both problems. Both problems would only affect some one who is not performing basic tank maintenance tasks.
Your cyano problem is about as related to the 61 tds of the pet store water you bought as I am. Check your levels of PO4, I and Ca+. Betcha the Ca+ and I are low relative to the PO4.

