Plants not doing too well

[Jtrain]

20 Gallon
water temp 78
PH 7.1
Nitrites 0
Ammonia 0
Nitrates about 15
Gh 8 (143.2)
Kh 9 (161.1)

I have been running 2 15 watt flourescents, just added a third and can hang for a fourth (looks rediculous though). 4 bulbs gives me 3 WPG, 3 gives me 2.25.

I have the Natural Plant System CO2 system in for about a week and it is bubbling nicely.

Substrate is rounded river stone mixed with small gravel and CC.

My plants are from Freshwater Aquarium Plants and it is the 20 gallon assortment. I don't know the names of them.

The plants were being eaten by my Brazilian Ramshorn snail. He no longer lives in the tank.

They appear to be showing signs of deterioration on the leaves. Thin patches that you can see through. Here are my pics so anyonw willing can advise me what to do. I know I should maybe be testing for iron and other stuff, but I'm not sure what.

P.S. I just added a piece of driftwood today.

By using Chuck Aquarium Calculator, I believe my CO2 level to be about 21 PPM

Thanks for the patience towards someone new to the planted take hobby.

:?

 

[kristap]

Jtrain - this link has some really good info to help determine any deficiencies you may have in your water by observing the state of the plants: http://www.aquariaplants.com/plantdeficiencies.htm. Maybe a potassium shortage? That seems to be a popular cause around here for us noobs

 

[travis simonson]

Potassium deficiency is definitely a possibility. Are you dosing any trace/iron mix? You could also have an iron deficiency.