Hi soggy,why rush mate?
Give your new scape time to settle in,
Are you using co2 as this will need time to settle and tune -in to where you want it?
Putting too much pressure on your system too quickly is always a bad recipe!
Hi rebel,In theory you are correct. Bear in mind that AFricana will lower pH to very low values. It's worth checking that but otherwise yes you can add fish immediately if the filter is cycled. I would however be cautious in the few 4 weeks incase the filter dies due to the extremes of pH.