In my view this is going well. It is interesting that even though they are a larger sized characin, they are very timid and easily spooked. I have noticed this with the three different groups I have had over some 25 years. And they certainly do like a good cover of floating plants. My last group in the 90g tank used to move lower in the water column after every time I thinned out the Water Sprite. They wold move back up to mid-tank once the plants had spread out more. This happened at every thinning; they do not like bright overhead light (natural, given their habitat) or being exposed to the surface.