Originally Posted by FiveToNineDesign
The black beard algae was almost 2 months ago, I gave it a month and a half with minimal fertilizer and can assure you something was missing because the plants had zero growth itís only now that I started fertilizing again that everything is starting to come back. I agree that it shouldnít be K deficient but Iím just going by what I can see. Even now cryptocrynes and Anubis are showing pin holes and yellow spots on the leaves. So maybe I have my nutrient deficiencyís mixed up but they arenít happy about something as for the Kh. I keep it there because I feel more safe at a close to neutral Ph for my fish and invertebrates than running a low Kh and having a ph swing.
Once again, you do not have a K deficiency. That chart you are referring to about deficiencies has probably done more harm than good. I don't know a single successful planted tanker who thinks they can diagnose a deficiency looking at those pictures. Throw it away. Forget about it. It's not helping you.
Let's put this into prospective. I dose 17.5 K weekly into my tank, which is heavily planted with loads of fast growing stems. You are dosing 68 K weekly into a tank that is very lighted planted with mostly low light slow growing plants.
Your very high K numbers are likely limiting the uptake of both PO4 and NO3.
Then you said you are dosing Seachem Flourish. Flourish only contains micros, no macros. Then you said you started dosing PO4 & Fe....how much? Then you said you were dosing Thrive+. Did you stop dosing it? If so, it was the only source of NO3 that you were dosing. If you stopped dosing it, most likely you are NO3 deficient if anything.
As to pH swings, that is a myth. I know loads of folks who run zero or very low KH tanks, and have for years. Never have a pH swing. If you really feel you must add some KH, I would go down to about 2 or so. It would bring your K numbers back down to something realistic.
But all that being said, you may or not have any deficiency at all. The plants you are keeping are not particularly sensitive to fert levels, and could get by nicely at a wide range of dosing.
More important is general tank cleanliness, the right amount/duration of light, and keeping CO2 steady.
How often are you performing water changes? What percentage? How often performing gravel vac? Filter cleanings?
If you really want help, I would consider starting a journal and list everything you can about the tank. When folks look at a tank in totality, it's much easier to diagnose problems.
I'm just saying that both of your original premises are likely wrong. You are not K deficient, and I very much doubt a clogged CO2 diffuser had much if anything to do with your BBA outbreak. You might need to dig a little deeper to get things going smoothly again.
And on a side note, if you want to improve in the hobby, start thinking of dosing in terms of PPM. Saying you dosed thrive+ or Seachem Flourish means little if folks don't know what that is adding to the tank. And most won't take the time to look it up. The common terminology is NO3, PO4, K, Ca, Mg and Fe listed as ppm.
Good luck and will be interested to see where this goes from here.