Bottom leaves turning black

[Tower]

Well, I have had my VFTs for about 2 weeks now. I put them in an aquarium and everything looked great until about 4 days ago. I started seeing a leaf on one plant turning black, it was against the soil. Now I have several leaves on both plants turning black. It seems only to be leaves that are at the bottom of the plant, by the soil. Any ideas. I make sure they get good air circulation too. I am going to clip off the black leaves, ensure lots of sunlight and water....and ??

 

[Tristan]

I think we need more info first. Heres a couple questions:
1. Whats your soil?
2.Do you use distilled water?
3.How much sunlight do they recieve?
4. How hot and humid is it.
If only a couple leaves turn black it may just be natural. It should put out some more leafs soon though.

 

[Tower]

The soil... Canadian peat (The stuff recommended on the flyer that came with them) from Wal Mart. Water.. Rain water or water from our pond. Sunlight...Lately 4 or 5 hours a day plus a 25 watt bulb above the plants for several hours. Humidity....not a lot They are in the aquatrium with a cover but I open the top during the day for air.

 

[Tristan]

They sound fine to me. In about 2-7 days you should see a new leaf or two. With the water try to put out your own very clean bucket and let it catch water.

 

[Tower]

Thanks for the help.
Ed