Hello, I'm back with some more troubleshooting questions!
To add some context: three weeks ago, my crypts all melted away. They are just now starting to grow back, but fairly slowly.
Baby crypt growing back:
Now I am noticing some other plants melting or deteriorating. It's most obvious in the Helanthium tenellum, but my larger sword (Echinodorus parviflorus Tropica) has also had some yellowing leaves (mostly older leaves, but some of the new leaves look a little yellow as well).
Yellowing leaves on Echinodorus:
I'm not very experienced with diagnosing nutrient deficiencies. It sounds like general yellowing/leaves reabsorbing into the plant can be due to nitrogen deficiency. But potassium can cause holes in leaves, which I see a little bit on the Helanthium (see red circle).
Any ideas what could be causing this? I'm in the stage now where I want to just add a ton of stuff to the tank to try and fix it - but I know I should be patient and take things slow
If it is nitrogen, how do you fix it? I had some algae earlier, and eliminated it by reducing feeding - I'm worried if I add more food, it could cause it to come back. Would root tabs be a good option in that case?