Ok, first thing you need to do is take the java fern out of the substrate. Java ferns should not have their rhizomes buried. The only part that can be covered is the brown/black root like things. Do not cover the horizontal fleshy stem or the plant will rot eventually.
From what I can see the other plants look slightly pale in the newer growth, though I am not sure if this is a picture artifact or if it is actually paling of the tissue?
The ludwigia in the third last picture might be suffering from nitrogen deficiency. The leaves seem to progressively get smaller as the plant grows, would you say that is true in person? Do you see this trend in your plant in general or not really?
What fertilizers are you adding and how many times per week for each?
Also, please rotate your pictures right side up before uploading them to the forum - it is very difficult to correctly figure out what is going on when you have to reverse every image mentally.