stem

Any ideas on why these stems are so brittle? I can be in cleaning up the tank or moving some rocks around and bump one of the plants and a stem will snap. Is this possibly a fertilizer deficiency? My tanks are heavily stocked with fish so I dont do much water column fertilization. Any ideas? I...

I have been trying to grow stem plants for the last 4 years with no luck. No matter what I do or how I fertilize the tank the tops thrive and the stem parts that are buried in the substrate rot away. The shoot out roots and rot away at the same time. My last failure has been with Red...