Java moss dying!

[dattack]

Hi, I was wondering why my java moss is dying? I recently bought a handful of really green java moss from LFS and now they are slowly turning yellow/brown in my tank. I have 60 gallon aquarium, 160W of lighting from GE chroma, 1 tsp of tmg/day, substrate profile, 3-2L DIY CO2, and 10 neons, 5 guppies, 2 Flag fish. It seems kinda odd because at my LFS, they virtually have <1 watt per gallon and they really don't even maintain their tanks because every tank is filty with lots of algae to boot. Do you think I should add more iron in the water column? I like java moss but it's the hardest plants for me to grown so far in my aquarium. I also have vals, anubias, riccia (floating but kinda yellow too), amazons, anarchis which are really growing well. Please help if you can.
BTW, I also bought 2 anubias gigantea and both of them had grown two new leaves and growing fast but they are also yellow.

if i recall - yellow leaves are a sign of iron chlorosis, are the leaves brittle? to help, add iron and potassium into the water. i am also guessing you have a very high GH. that is another cause. i'd try and bring down the GH first, then work with the nutrients.

[dattack]

How do you decrease the GH?  Does that mean I have to use RO water instead of tap water.  I think my tap water is very hard because I can get a lot of calcium buildup on my glass cover.

you could use RO water, or you could filter through peat. it will make the water a tea color, but it will lower the GH. if you are looking for cheap, the peat is the way to go if the tea color doesnt bother you. RO water can get quite expensive, but that is an alternate. what fertilizers do you use?

[Matt Nace]

I have very hard water, and I grow plants without a problem.

My java moss also grows in all my tanks, and some of those have no co2, ferts added, or very good light(like 15 watt over a 10 gallon.) Mine was brown when I bought it, and now is a lush green in every tank.

Where is exactly is the moss(not that it should matter) Mine was tied at the bottom with a lead band, a placed it on the gravel, next to my wood.

My other tanks it near other objects.

It is right in the current of my full planted, yet shaded some from a bronze wendtii.

Try moving it out of maximum exposure from the intense light.It may do better in a shaded or subdued setting.

Yellowing can be from Potassium deficiency(a sign in new young leaves) Iron chrosis is from lack of iron and potassium, and our hard water doesn't help any.

If it is just the edges that are yellow, that can mean calcium deficiency.

Make sure you use a fert that has iron, potash, but you need the trace elements like nitrogen,Potassium,Phosphorus,calcium,magnesium,ma nganese,molybdenum.

Kents freshwater essential has this(except the nitrogen and phosphates) I am sure there are even better plants trace ferts, but I had this on hand.