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> The vals will eat the HCO3.
> You might think you have enough CO2 right now. Before the lights come on
> when CO2 is highest. Check right before it goes off. What the difference
> now? Does it look like the pH has climbed to 7.0 or higher? If so, you
> to add more during the day.
> Keep the pH at 6.4 to 6.8. I crank mine during the day. I turn the CO2 off
> at night. Don't need it and don't get that low pH in the AM.
> Also you said that your KH was 2-3 there and now it's raised up to 3-4.
> getting it to 5. Keep the pH around 6.7-6.8. As that KH drops so does the
> CO2 amount in your water and the more your Vals etc will use the HCO3.
> Just keep the KH and CO2 higher. It should balance out once the CO2 level
> As far as adding the KNO3. Add no more than 3 x a week(1/4 teaspoon each
> time), add some algae eaters in there now. Each dose of KNO3 will add
> 6ppm of NO3 and 4ppm of K.
> Add 1/4 teaspoon of K2SO4.
> Raise your GH to about 5 or so.
> Add 5mls of a trace mix(comporable to Flourish or TMG 3 x a week, maybe a
> bit more.
> A small dash of KH2PO4 3x a week.
> I don't mix a all in one PMDD. I keep tabs on each, mainly KNO3 as my main
> control variable.
> Try this. It should work pretty well and give things about 3 weeks. This
> should get you by well till you get a nice NO3 kit(unless you already have
> one). I suspect the kits may not be giving you the right amounts. 10-20ppm
> drop is not quite right.
> Tom Barr