Thanks for the tip...
That is the thing, when to stop?

I have now 9 plants in my 33Gal tank, and obviously there are still
some empty spaces that could be used for more plants.
But I have to stop and leave the tank alone.

It does look alot better with the live plants. I still have a couple
fake plants that as the real ones grow I will replace them for good.

I like the cabomba, it is a nice plant and I hope it will spread
quickly.
But my favourite plant right now has to be Echinodorus 'Red Special'
It is a gorgeous plant, I need to take a pic of it and make it
available to you guys, I really want you to see it.

It is beatifull, the shape of the leafs, the reddish colour of it,
beautifull... The only complaint is that it takes alot of space that
could be used for more plants.