What I need to do

[gilya]

Co2 and 0.7 w/litter
How can I help this plant to grow well ?

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[Martin in Holland]

Watt per Liter is not a good way to measure light, PAR is for a planted tank the only way to go......best google "PAR chart".

 

[ian_m]

Your 0.7W/litre is equivalent to 2.5W/Gal (US) which puts the tank into the high light zone (above 2W/Gal). Thus you will need spot on CO2 flow and distribution if you are not to suffer algae and plant issues. Mechanical damage to plants, other then fish nibbling, is a sure sign of poor CO2.

Really we need some more details, tank volume, tank size, light type, lighting period, CO2 period, CO2 diffusion method, filter capacities, filter output type as all these are relevant in diagnosing your issue.

 

[xim]

Those plants in trouble, did you get them already in long stems and not trimming them before planting?
I mean if you did that, as the plants are adjusting to the new environment of your tank, the old leaves
that are not suitable to this environment will be neglected by the plants and will deteriorate away.

But if you did trim them before planting, then I think CO2 and/or ferts shortage.

 

[spyder]

As Ian says more info would be needed about the setup.

99% of the time it's down to co2 and flow/distribution.