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Poor OP. Just wants to get rid of cyano. And we're working to figure out how to grow the stuff.So if dosing nitrates can work sometimes and sometimes not......what is my next step if the nitrate dosing doesn’t work??
If you want to try some of the theory we're discussing, then in addition to nitrate it may be interesting to vacuum the cyano/debris and top layer of sand at the trouble spots and sprinkle fresh aragonite sand in its place.
Adding nitrate, removing particulates, destroying nutrient gradient in the sand, adding fresh aragonite phosphate sponge.
That should cover most of our favorite theories at the moment. [emoji846]