salt killing my plants?

I set up my 10g and stocked it with 6 black skirt tetras from a reputable lfs, and (something I will never do again) 2 catfish from walmart. the catfish of course got ich, and died, along with one of my tetras :sad
I attempted using QuICK Cure for a while, and that's when the 3 fish died. then I changed 50% of the water and used 1tsp salt per gallon, and since then all the fish are doing great. unfortunately, my plants are not. when I noticed the plants become sickly I started adding iron rich fertilizer and water softener ("black water extract"), temperature was 78F but is now 86F for the fish. I have an undergravel filter, and a power filter for turbulence. this is my first time keeping live plants. I put in the tank one java fern, one "palm", and two rosette plants that I am having a hard time identify. (they came in the same pot, but I replanted them seperately and carefuly took them out of the awful material they were planted in. were about 3-4" tall when I bought them, green leaves with white in the middle).
now, the java fern had been in the tank even well before the fish, and was doing great the whole time, even without softened water or fertilizer. last week I bought a new flouresent bulb for fish and plants, as the other one was getting old. I added the other plants at the same time, with the fish. the fern had been doing awsome until I noticed it today, and now it is begining the same symptoms that have almost killed the rosettes: leaves slowly turning clear, usually begining with the ends and moving down, until the whole leaf is clear and soft and comes off the plant very easily. I planted the rosettes so all their roots were under the gravel, exept one plant which had the very top of one root visible. I thought it would be fine, but then that root turned brown and now looks black. I think I will remove that plant today, it looks totaly dead. The others I will remove later today and put them in a bucket with heated, softened and fertilized water... but no salt!
to make a long story short: is it the medications that are killing my plants? if not, what is? thanks!

Thanks for the comment on my sig image ^^

sorry I forgot to say, the java fern's roots are partly sticking out, it is the rosette plants and the "palm" that I planted all the way.

I only bought a few plants at first so that I could get used to keeping them, and then buy more. I am glad to only have a few plants die, rather than a whole tank full. plants can be expensive, and as a student I don't have much moola (although christmas may promis me some pet store gift certificates!) Do you really think that having too few plants would cause them to wither?
I have looked through the newbee sticky, but was overwhelmed by too many new minerals and nutrients to memorize @.@ I was wondering if there was a specific lacking that would cause my plants to go glassy.

the salt I used was regular table salt, to treat the ich on the fish. it wasn't intended for the plants at all, and since adding it the "palm" appears sick.

the water softener I use is "Blackwater Extract" which I got for the fish. it says it consists of "trace elements, vitimins and valuable extract of peat. It creates an environment similar to parts of the Amazon River and other natural, black water biotopes....promotes fish activity levels" vitimins are: B2, B6, B12, Nicotinic Amide, Panthenol, Vioein and peat extract.
My tapwater hardness is about 200ppm, so I think I need some sort of softener for the tetras.

the fertilizer I use is liquid "Plant Gro Iron Enriched" 0.15-0-0
My mum gardens, but I forget what those three numbers mean.
the bottle says it contains:
nitrogen(N): 0.15%
Iron(Fe): 0.26%
Manganese(Mn): 0.05%
Zinc(Zn): 0.003%
Boron(B): 0.0005%
Copper(Cu): 0.0005%
Molybdate(Mo): 0.0007%

The new bulb is Aqua-Glo for freshwater fish and plants, 15" long, 14W.

I want to organize everything in the tank around the tetras, so if there are certain plants that do well in that kind of environment I would pick those

hmm. yes, I think I did notice holes in the leaves before they died. I will remove the remaining plants and keep them in fresh water until I am finished treating for ich.
in the future when this tank is more heavily planted, if the fish get sick again would it be okay to treat them with sea salt? I have some "Rob's Red Mill All Natural Sea Salt" that says it is "made from purified pacific sea water by an all natural evaporation process. it has a high sodium chloride content and contains all of the minerals that are usually refined out of ordinary earth salt." I would have used this to begin with, but I thought I was almost out.. turns out I have more than I thought. would it be okay to add this at the next water change? (which will be later today, once the water warms up enough to not shock the fish) I will only add enough to replace what I take out.
On the 25th it will have been 10 days since I started treating for ich with the salt, so I will lower the temperature again to 78F and change 50% with fresh water.

qtaquaman said:

Check for iodine if it's all natural it should be ok. Clout is a good cure for ich and I'd set the temp to 82ish. If you use clout remove your carbon from your filter during the days that you treat with it and treat for two to three days after you last see ich. Also keep the tank in the dark as much as possible, if free swimming ich can't see fish they can't attach themselves.

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I don't think anything has been added to this sea salt. I'm thinking I will add it to the water I intent to add today during the change. so half the water in the tank will be old with table salt, and half new water with the sea salt. I hope that is okay. I'll have to keep lots of this sea salt around, I like it better than regular salt for everything anyway (cooking included).
I removed the carbon while treating with quick cure, but have put it back now with the salt. I keep the light on now too, and no signs of ich. I am counting on killing the ich with the salt while they are free swimming, and catching the whole lot of them that way. seems to be working awsome. I thought the lights should stay off because it deactivates malachite green (in ich medicines)?

thanks everyone. I will try your advice and see if my lfs carries seachem flourish. do you know how much those usualy cost?
I'll lower the temperature on the 25th and start removing the salt; I think everyone in that tank would like it down but I don't want these ich coming back. less trouble to kill them all now than deal with them again later.