Hello

[Reptileking]

Hi i have a exo terra 18x18x24 and i just completed my first vivarium. I fell that there is not enough light i have to exo terra 26w natural light bulbs the plants are doing ok but dying towards the ground . Have a ficus and a pothos with one male crested gecko. My question is do i need to add more light?

 

[acpart]

I can't tell you exactly about the light but I do know that plants differ in the degree of moisture they need and direct vs. indirect light as well as temperature. The plants that aren't doing well could be not doing well for many reasons. I have killed quite a few plants in my day.

Aliza

 

[CrestedRick]

Here is a link to the place a deal with for all my supplies. Each category has a subcategory and will explain the moisture and light needs of each plant in that category, you should give it a look.
NEHERP - Live Vivarium & Terrarium Plants
These next two articles will address vivarium lighting such as how much for each enclosure size and types. Definitely read them for a better understanding, they helped me tremendously.
NEHERP - Vivarium Lighting 101 - Everything you need to know, to grow plants in a live vivarium
NEHERP - Introduction To Vivarium Lighting (Basic)

 

[CrestedRick]

Also from the looks of the pictures, you aren't getting enough light penetration due to the pothos blocking the light from reaching the ground. That may be the issue alone