No idea what the g is on the filter, its a juwel bioflow 3.0.
My latest test results are 7.2 ph 0 ammonia 0.2 nitrite 10-20 nitrate
when i was having problems last month mynitrate level was 30 then went to 100 the next day, i treated the problem and it went down to 20 the week after, ,the nitrite level was at 2.5 when nitrate was at 100.

I have recently added live plants to the tank, not sure if that will help them out in any way??

had a weird incident the other night, Iv had cloudy water issues for a while but been trying to keep it under control with green away which seemed to clear it up a lot. Anyway, the water hasnt been crystal clear for a while but nowhere near as bad as its been, i do my weekly changes and it clears up a little with the green away then stays as it is which is slightly cloudy. The other night it seemed crystal clear in one corner where 2 new plants are but the rest was a little cloudier, the night after i got home from work and the water was crystal clear........no idea how or why but im not complaining