Plants are looking good. The Ludwigia has really started growing. I bet it has a decent root system now! :D yay!
Maybe once it gets some serious growth you can clip it and move the clippings to the bigger tank! :D
I like the floating wisteria, its starting to bend and release new roots! It's awesome. Looking very good. Have you considered clipping one of the wisterias that is floating or both and plating part of it. That way you have more plants, more on the ground and it will grow in four places instead of 2.
I am really liking where you are taking these tanks. The new light in the 75 looks awesome btw, you can see the color difference.
Love the fish! Beautiful!