Thanks SO MUCH Robert, you are my hero! I`m sorry for the long list of questions, I really appreciate the fact you took time to read and reply. That link is very helpful, my understanding with how the filter works, if the water is not suffering any peaks in the bad toxins, and all is tickity boo, the cannister can be primarily for the culturing of the good bacteria, so the course strainer pads first stage, a secondary mechanical substance (pre-filter or poly wool?) in the lower basket to ensure waste free water passes over the biomax, the only time it would be necessary to use carbon or ammonia remover would be if the water quality test results were in the high range. Otherwise the water should look after itself, with weekly partial water changes and gravel cleaning.
The literature doesnt really make that clear, I always thought you used carbon and the other media all the time regardless of the results from water testing.

Thanks again for your help in these initial stages, I know if I do things right now, it will pay dividends in the long run.

thanks again xxxx