I had the same thing start to happen to my red rubin swords. LeighMo
suggested, like you said, that the leaves that come with the plant have been
grown out of the water and to cut the yellow and dying ones off. I then had
different shaped new leaves pop out of the plant. The new submerged leaves
will indeed be a different shape and more fragile.

It is also a good idea to use root tabs or jobe's fern spikes

"WD" wrote in message
news:7M_1a.68512$vm2.40781@rwcrnsc54...
I understand that many aquatic plants are grown out of water, and these
leaves will die, being replaced with new. I recently bought 3 large amazon
swords, and the leaves are yellowing. At what point should I worry? What
can
I do to ensure their survival?
75 US gallon
20 gallon sump, standard overflow
40x4 flourescent, timed, 11 or so hours per day
heavy fish load (barbs, tetras, loaches)
moderately planted, java fern, java moss,anubias, anacharis, amazon
swords.
Using seachem florish, seachem trace according to package directions.
ph 7.1-7.2
temp 78f
nitrite0
ammonia 0
nitrate 80ppm+

Yeah, I did each test as I wrote this. The nitrate results surprised,
shocked, and horrified me. Water change scheduled. Like 10 minutes from
now.g

tia

Billy