cheers for the comments, it was full of cabomba but it made the tank look messy and grew way too fast. the main plant (the name of which i dont know) grows well and when a little bunch has grown the main stalk holding it to the main plant does off so you end up with another plant. Brilliant!
im aiming to put another bunch in the left corner, might take some from my main tank. see below:
and my prize fish... my big rainbow...