sorry for my slow reply..
ok i am looking at the 3 pic down along the front line i see a sword (probably amazon), green temple, some anacharis, another sword ( probably amazon) and some more anacharis
starting from the left
the sword is grown emersed and is becoming immersed so it WILL show some browning leaves and leaf die off as it converts to fully aquatic leaves.
the green temple is Always sold in emersed form and will convert and develop new leaves that are longer( not as wide) and a lighter color of green as the emersed leaves die off
the anacharis ( AKA elodea) is a fast growing light needy stem plant.. I see this bunch has reduced in number from an earlier pic it is probably ok now.
the sword is going through same as previous sword..
the last bunch of anacharis needs to be planted as individual stems.. it probably still has a rubber band at bottom.. remove that rubber band, remove ANY rotten stem at the base, divide the stems up a little and give them enough space to allow water flow around them.. just enough so they are not jammed against one another.. they will rot less this way and establish themselves much quicker without losing nearly as many stems over all.