The Planted Tank Forum - View Single Post - Potassium reference solution
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post #3 of (permalink) Old 07-12-2016, 10:52 PM Thread Starter
Fissure
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Quote:
Originally Posted by Solcielo lawrencia View Post
It's a trace toxicity, most likely iron. If the lower and middle leaves show loss of color along with the necrotic lesions and holes, then this strongly indicates iron tox. Iron and the other metals are not needed in the amounts most people think plants need, not even 0.1mg/L of Fe per week which is beyond excessive. Most of it will accumulate, damage cells and impair photosynthesis. If you've been dosing like this for at least several months, and the substrate is high CEC, and only recently had this become an issue, then the soil's adsorption capacity has been reached and all the metals dosed will be in the water column causing problems. The soil is most likely toxic at this point. Maintaining a high pH will help reduce the availability of the metals on the substrate which lowers uptake and can help prevent toxicity.
This has been an issue since the start of tanks. The larger one has been ran for over 2 years now and the smaller is just a couple of months old. The smaller one has just finished its run in period and is now algae free. I have not started E.I dosing until a little while back but the pinholes have been there pretty much since 2-3 weeks after the startup. On this tank I have been dosing E.I for the last 4-6 weeks but the Micro dose has been cut by around 1/3. The substrate is new so I doubt it would have went toxic from that.
The large tanks trace dose has been cut in half, would have cut it more since the FE levels are still a bit to high for my taste but won't bother since I am replacing the TNCTrace/CSM+B with bought liquid micro ferts with stronger chelates instead. I will follow Aqua rebells E.I dosing amounts which to my calculations should add around 0.15 ppm of iron each week (3 day dosing). That is a pretty lean dosing in EI terms and I hope and think should rule out any such possible issues. Contains some K and Mg as well which should not hurt?


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