[bharada]

Mine seem to get this way when I have excessive K. Sometime it's a fine balancing act since my L.repens would start developing pinholes and I'd add some additional K, only to have the Alternanthera stunt.

 

[bharada]

...because I'm too damn stubborn to believe I cannot grow a healthy stand of it!

Haha! Ain't that the truth!

I've been going round and round with my repens, swapping it back and forth between my 40 and 125. I've actually had a lot more succes with L. ovalis, which is funny because when I bought it a few months ago, it all but melted away. I thought I had tossed it all when I noticed a single stem growing behind some driftwood. It has since developed quite well. Plus it's had less of a tendancy to develop pinholes.