Just when I think I got it all figured out something else happens. I guess that's what makes this hobby fun huh? lol.
Here is my current issue. My tank grows, but some plants die back, stunt, curl, or don't grow great after a bit. I've tinkered with everything in the last few months, and each time see more positive changes. I think I'm real close now to nailing it.
Right now rotala colorata just isn't growing great. some grow slow, some stunt, and then a few look great and color up with nice long leaves.
Trident java fern, two huge portions I got from a member here in great condition. Did well for a month, then I started seeing browining and die back. New fronds are growing though.
AR mini. Old leaves algae ridden with GSA and curling. New growth now looks great. Some curling still, not as much.
Ludwigia Cuba. Some grow great fore a bit, color up, then grow less, stunt, or just smaller growth.
Tank specs: Two BML Dutch MC's running at 45% 7 hours with a 1 hour burst to 100%. Suspended 9 inches from water line and tank is 17 deep. Pressurized co2 maxed out, just slightly backed away from fish distress. It's a GLA regulator, no concerns there. Co2 is delivered in line with an atomic diffuser and a violet pipe is on the out flow. Koralia nano 240 is just below the pipe and blowing in the same direction to increase flow.
Recent changes: I moved the koralia to its current location to really create a nice smooth flow around the tank which can be seen when feeding flakes. Great flow now, this is something I lacked previously and I saw increased growth in a few days. This is good. Ferts, EI dosing is used. For some reason along the line I got out of dosing K2SO4 and relied on KNO3 for K. I'm wondering if what I describe and show below is a K issue? I do have leaves dropping (older) a lot. My skimmer grabs them all the time. I started dosing K2SO4 to bring K totals in line to EI. This should help. I switched to Miller's Microplex last week also. I suspect my tap water is lacking Mg and is all CA for GH. GH here is 6 and KH is 1. I started adding a tbsp of GH booster on water change day last week. This should get Mg in my water.
Can I expect to see my tank smooth out in the next few weeks from these changes? Do the photos below look like K deficiency or something else? All feedback is welcomed, thanks!