are we talking floaties or cloudy? cloudy suggests bacteria bloom from a tank not fully cycled or put into a minie cycle. what are your water perams? ammonia,nitrite, nitrate.
PS - When you have a properly implemented UV sterilizer(which you would with the 12x and the 405 in a 125g) your tank can look very good while the water is very bad. Do not use water clarity as an indication of water conditions or get lazy because it looks so good if you do this.
Ok well just got back from local aquatic shop with polishing pads and filter floss daft question do I place the polishing pad in the bottom tray on the fx 5 as it says on the box or tge top tray as ive read other places?