I agree with all that you posted above, just wanted to add a couple of things.I don't use test kits really to measure ferts etc. I heard that all Iron test kits are really crappy anyways.
If your doing 2 water changes a week, I wouldn't think you would have to worry about to much. You may even have a lower nutrient count than if you did one 50% or bigger.
I read a nice article in TFH about water changes. Your right you can never do to many, but it depends on the quantity that your changing each time. 1 50% change is better than 2-3 10-20% water changes a week. 2-3 50% changes is even better obviously. But for planted purposes I would say that at least 50% a week is plenty due to adding ferts purposes. The more often you change, the more often you add. It's really up to the individual.
Using – Mixing Dry Chemicals for Seachem’s Dosing
Seachem’s products are a little expensive, but they are very good. I know some people would like to cut the cost some and use some of the dry fertilizers that are available.
The following dosing solutions will be practically the same strength as Seachem's macronutrient products according to the online calculators. You then go by Seachem's recommended dosing amounts on the calculator.
Dosing Solutions
- Add 62.2 grams or 11⅛ tsp of KNO3 to 500 mL of distilled water for F. Nitrogen Substitute
- Add 3.5 grams or ¾ tsp of KH2PO4 to 500 mL of distilled water for F. Phosphorus Substitute
- Add 51.0 grams or 8½ tsp of K2SO4 to 500 mL of distilled water for F. Potassium Substitute*
*(This amount approaches the maximum solubility of K2SO4 of 12 grams per 100 mL of distilled water. You will probably need to shake the container each time prior to dosing.)
Online Calculators Used:
http://www.fishfriend.com/fertfriend.html
http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm
http://www.aquaticplantcentral.com/forumapc/fertilator.php
IMO, you may omit F. Trace even though it is included in the calculator.
I do not have a substitute for Flourish, F. Excel and F. Iron at this time.
I hope this helps you. Let me know if it works well.
Left C
I would say don't change, if your tank is seemingly OK with your current agenda. I was just stating, that if you change twice a week, your taking out nutrients from the first fert dose, so your going to need to add even more on the second WC day in a 1 week period. Since the "norm" of a fertilization schedule seems to usually be completed throughout 1 week with 1 50% WC and repeat again. Does that make sense? Don't know if I worded it in an understandable way lol. 50% each time is good, 50% is the minimum I would do on a WC. So I'm sure your fish are really happy and your tank is very free of pollution.I agree with all that you posted above, just wanted to add a couple of things.
I do W/C twice a week. Every Sunday and Wednsday, 50% each time.
Are you suggesting that I decrease this to 1 50% W/C a week?