Update..
Tank looking a little clearer, got some B-Clear for LFS, however that hasnt done much good, tank is no longer green looking anymore but still a little murky/white, even after two doses of this product!
Rinsed all the filter media in some tank water in a bucket and cleaned out the hoses that were lined with a light brown goo that smelt like compost!
Had to do another 50% water change to try and rid the murkiness however still the same. PH 8, Amm - 0, nitrite - 0, nitrate - 5
Been told you use Magi Clear now. I wonder if this will work or will be another waste of money on useless chemicals in my tank!