I am having the same problem with my HC, planted 8 pots in the foreground and its not really doing anything, its grown but very slightly and not spreading out across the foreground like I had hoped
I have some glosso in the tank and its doing great.
I have a little eco complete in with the flourish but only a bag or 2 and I put in at least 7 bags of flourish, I've heard the eco complete can raise the hardness in the tank, I use 2/3 RO so my water that goes in is pretty soft, as well as peat granules
if it doesnt do better soon, I'm pullin the glosso cuttin it up and spreading it around better since its already takin over the area's planted with it.
first time with more demanding foreground species as am pretty new to hobby