Hello! I'm new to planted aquariums and I have a planted tank that I set up three weeks ago. My brazilian pennywort seems to be doing fine except that I just noticed that the stems are dying off at the base and then the rest of the plant is separating from it and floating up. I'm fine with it just being a floating plant, but I was just wondering if this is normal or if something is wrong that I should be concerned about? My water tested fine. I'm using flourish excel, and I have about 1.7 wpg of T5 lighting. Thanks in advance for the help!