OK, so I thought I had nute burn...lowered nutes, new water..still need help w/ pic

Here is my plant. umm...so I began using full nutes too early on (noob mistake) and then realized it. So, I added another air stone, changed the water fresh, added only half nutes, and the plants were doing really well. They have grown a lot, but some leaves are still showing signs of something. Any ideas whats up with the plant? Could it just be that the plant is still recovering? Or maybe it needs more nutes now?

how long has it been since changing to 1/2 nutes? if the tops of the plant looks good and lower leaves show sign of stress i wouldn't be as concerned but still keep an eye out

it has been about 6 days since I changed the water and added new 1/2 nutes. Are the brown/rust/dry spots on my leaf common look for this problem? PH seems to be normal, temp is fine, the plants are growing like hell...just this little problem.

those spots are prolly nutrient burns...once the plant gets taller and has more sun leaves trim the lower ones w/ the spots. keep and eye out to make sure doesn't get worse

what does it mean if these colorations start moving up the plant?

too many nutes that are prolly locked up in the plant...it could be a deficiency of something as well