Colored plants use alot more phosphates than all green plants and depending on the amount of plants you have that will also help determine how much is used. Each tank has different needs. Your fine.
Update the ludwigia is doing well
The Val's have nice new growth
And the swords look better and better
Sadly I was gone on a ski trip for a few days and I came back to some rough looking roseafolia. I doubled my pottassium dosing as I think it is one of the issue but I think it's also that I do not have enough lighting. I have t5 no dual 18 watt 6700k. Do you think it's lighting or just the pottassium.