I have a Echinodorus cordifolius. I planted it in the tank for 3 months ago. It has grown new leaves , but now they get brown and melt at the basis of the roset. I have never seen this before. Whats cause this?
I think you are right. Its a 325 l tank with a lot of plants with a long (as long as the tank) spraybar in the back. A co2 reactor is coupled to a canister filter (1200l/h). I think that the cirkulation is too poor at the bottom. A photos of the tank and the Echinodorus is attached
I had those (or very similar) way back on a couple of occasions. I think its broad leaf chain swords, but not 100% sure... They are supposed to be "easy" and they seem to start out good, but mine got into trouble (melt) when they began to propagate / chain like crazy. What I later learned was to detach / cut the roots when the runners matured and that went way better. Don't know if that applies to your specific situation. Nice tank though - looks very lush.
Hilsen / Cheers,
PS: Don't think there is any particular reason, that I can think of, to be sorry about living in Denmark