Plants Dying

[Blue_Ram]

I have orderd plants and have had them in my 38g for almost 3 weeks. I have a Co2 system and have been adding fertilizer on a weekly schedule. I have done 30% water changes every saturday and have 2 watts per gallon for lighting. The only fish inside the tank are 3 cherry barbs right now, but this weekend I am getting 6 more cherry barbs and a bristlenose pleco. The plants I have left are as follows:

[FONT=Arial, Helvetica, sans-serif]1 Anacharis[/FONT]
[FONT=Arial, Helvetica, sans-serif]3 Japanese Fans[/FONT]
[FONT=Arial, Helvetica, sans-serif]1 Dwarf Lily Plant[/FONT]
[FONT=Arial, Helvetica, sans-serif]4 Dwarf Onions[/FONT]
[FONT=Arial, Helvetica, sans-serif]10 Tall Sagittaria subulata[/FONT]
[FONT=Arial, Helvetica, sans-serif]1 small red-spot Ozelot sword[/FONT]
[FONT=Arial, Helvetica, sans-serif]8 Crypt Walkeri[/FONT]
[FONT=Arial, Helvetica, sans-serif]4 Java Ferns[/FONT]

Here are the questions I have. Why are my plants turning brown and yellow and then dying? What do I need to do to save the rest of the plants?

Are Japanese Fans a floating plant?


My Java Ferns and the Dwarf Lily are doing great, but they are the only plants that are doing well.

Blue_Ram

 

[jmhart]

Do you have any idea what your co2 levels are?

Also, what kind of bulbs do you have? If they aren't the correct temperature they won't be beneficial for plants.

 

[Blue_Ram]

I have flourescent bulbs and I have no idea what Co2 levels are at. Is Carbonate Hardness testing for Co2?

 

[jmhart]

You can test your pH and test your KH(carbonate hardness) and get a pretty good idea about your co2 level. Check out this website:

http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm


Also, what temperature are the bulbs. It sounds like your bulbs are likely ~3000k. Plants need bulbs in the "Daylight" spectrum: 6500k to 10,000k.