Any of these should be fine: http
/www.tropica.com/plants/difficulty/easy.aspx
It is best that you try out different species, in addition to the silk plants you already have. Once you get the feel for what goes and what doesn't, replace the remaining silk plants as you like.
I recommend you get the following species to start with:
* 1 Bacopa
* 1 Crypt (these will melt to start with)
* 2 Hygrophila
* 1 Ludwigia
* 1 Vallisneria
..and these specific species:
* Java moss (tie to an ornament)
* Amazon sword (1 plant)
* Java fern (tie to an ornament)
* water lettuce
Then see how those do and pick your next round of plants based on what does well and what doesn't.
You probably want to start your lights on 8-10 hours total, then increase/decrease depending on how the plants do. If you want your lights on in the mornings or late in the evenings, you could try 5 hours on, 4 off, 5 on, off for the night.. it works for some people.
Once you go for plants, it is easiest to go all the way and do heavily planted.. I have found that a half way solution is quite difficult to maintain.
For planting, take the weights and pots off, plant each plant/cutting 3-5 cm apart and be aware that the fish will pull them up and you will need to replant them. With experience, you will learn how to plant them in a way that the substrate holds them down well.
As I said, not all of these plants will do well for you, but in my experience, these are most likely to do well. There are experienced fishkeepers who do keep silk plants, but maintenance requirements without plants are much higher than with plants because if you use plants, you can get a lot closer to a closed ecosystem.
p.s. check the plants carefully for health and algae.. pick healthiest looking ones and don't pick any which show signs of algae.
