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Originally Posted by scolley
1) Is it better to auto-dose with a level target? This implies that after each water change you have to perform a "gap dose" for the new water.
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I don't want to overcomplicate things. It would be easy to do with a timer like I am using... they allow for up to six programs per day, and I am only using two right now. So you could dose every day twice, but the day after water change 4 times! However, I don't think the absolute level is all that important, as long as the overall proportions are okay and nothing has bottomed out completely.
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Originally Posted by scolley
2) Do you dose micros on the same day as micros? And if so, do you dose them daily (obviously in smaller doses)?
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Yep, like described earlier, I have them on the same timer, and dose daily (right now twice daily for the 100 gal tank). I used to dose twice a week, so I just multiplied what I dosed by four, which gives me a 2 week supply.
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Originally Posted by scolley
3) Do you do periodic testing to understand your plants uptake rates set your auto dosing levels accordingly? Or do you do adopt something closer to an "autodose EI", with target assumptions and allowing water changes to keep this from getting to out of line?
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Yes, I test for N and P. Last week I did and P looked perfect in both tanks, while N was too low in the 100 gal tank. I had noticed a little more BGA growth on the substrate... which is another visible proof that the N went too lean. So I adjusted the concentration in the bottle.
I am just too curious to not test. But I guess after a few weeks of steady results and good plant growth I will probably only test when there is some sort of issue.