Can't grow anacharis or hornwort(!)
Every plant I've tried to grow had either thrived or at least not melted away, with the exception of anacharis and hornwort. I've also tried another elodea-like plant as well, and it, too, melted.
This is puzzling. I've got hairgrass, chain swords, amazon swords, bacopa, ludwigia - all really doing well. The anacharis-like stuff, though, melts within a few days of introduction and seemingly lives only at the very tips.
The hornwort melted literally overnight.
Water: (in a 75gal tank)
KH: 4.8 degrees
CO2: ~30 ppm
GH: 3 degrees
Temperature: 77 f.
NO3: 12-15 ppm
PO4: 0.5-1.0 ppm
K: 1.5x kent's recommendation
Traces: added weekly with flourish
I do weeklyish large water changes, using my tapwater's 3ppm PO4 to boost my tank to slightly over 1ppm PO4. It takes about a week to get down under 0.5ppm. My tapwater is VERY soft and poorly buffered, so I have to add bicarb and GH reagent. I dose nitrate and K at water-change time.
4 x 65W 10k/6.7k PC
10.5 hr photoperiod
Substrate: flourite with a sprinkling of sand.
Watersprite, bacopa, lugwigia, et al. grow visibly in the course of a day, O2 streaming like mad, etc. Bacopa has actually taken to growing *out* of the water!
When I brought the anacharis home from the LFS, its leaves had all these little crystals (some insoluble carbonate, I assume) and these have all seemingly gone back into solution or have been resorbed by the now-melted parts of the plants.
Anacharis is one of my alltime favorite plants, and I've *never* had good success with it. Worse, it seems to be something that grows like a weed for normal people.
WTF am I doing wrong?