Cant get Alk down

[Spuds725]

What is "coraline stimulator"

I suspect, it is adding carbonate (boosting your alkalinity).

Another potential source could be your make up water-- some water does have significant amounts of carbonate in it.

Assuming your levels are being read correctly by your test kit, they should come down with coraline/coral growth-- just maintain your calcium at that level or slightly higher and the alk should come down on its own.

//edit//

Did find this stuff-- http://www.jawz.net/400061686604-cor...ulator-na.html

It doesn't appear to contain carbonate???

Coralline Stimulator is enriched with chelated iron, iodide, strontium and other essential trace metals and vitamins including B12, biotin, and thiamin. Formulated and manufactured by FAF.