WOW thank you all for the replies
I dismantled the set up and couldnt find anything at all wrong. I filled the tank up and it was fine!
I have to admit when I saw the first few comments I got disheartened and thought OMG I have to fork out even more money on my crossfire but as robby363 said, it was just overfilled. On the tank reservoir there is a note saying overspilling will occur if overfilled but i never thought it would look like a blooming leak ha!
Problem solved...until the next time