Thanks, I know that PMDD is not the most current method but it's a proven system and my tank is not a high tech setup. It should work just fine
I really don't understand why the plants stopped growing. I was thinking it may have been because the plants that I keep are not that demanding to begin with, and that they may have grown with what the fish were providing them. Since I started the tank the plants did really well and spread out rather quickly. There may be too many plants now competeing for what little nutrients there is. That's why I'm now toying with adding ferts. Thanks for the heads up reading PO4 and trace. That's really good to know.
I have heard that overfeeding fish is a method used by some people. However I do not know of anyone who does this or how it's done properly. I thought I would ask here for some input.
Thank you for your insight gmccreedy. You have been quite helpful. I might try the EI method with my other tank later on. I would like to try both methods just to see what works best for me. I will have more questions later on. Again thank you.
PMDD is developed with the notion that PO4 limitation, is a good idea for algae control.
So add some KH2PO4 to the Macro's, keep the trace mix separate.
So have a bottle of PMDD and then a bottle of KH2PO4.
Not just PMDD.
The lull you see is likely due to low PO4, adding it should increase pearling of the plants and increase the clarity and reduce the Green spot algae.
So add about 10ppm of NO3 worth and 2ppm or so for the PO4.
This will likely rev up the CO2 demand so make certain you have a good handle on that.
Poor CO2/circulation causes about 95% of the algae and plant growth related issues folks have.
If you limit say PO4 severely, then the CO2 demand will go down, because you have limited PO4 more strongly than PO4.
So this led folks to think that PO4(or any other nutrient that's strongly limited) causes algae when it's higher/excess etc.
However, it's not.
You just relieved the PO4 limitation so now the plants need more CO2 than you had been supplying. If you added plenty of CO2 to begin with, you'd never see the issue with algae when you add PO4 at high levels.
Good example of how correlation does not = cause.
While PMDD may be what some here considered to be old, all the methods pretty much that involve dosing liquid ferts are based around it.
NO3 is still NO3.
K+ is still K+.
PO4 is still PO4, whether made by ADA or bought at the Ag supply store in 25 Kg sacks.
I'd suggest watching your plants and CO2 the most, and then dose well/do water changes often etc.
That should keep you out of most trouble.
It's not, but