setup your tank, and if you have an old tank use one of the dirty filters in the filter for it and should work in a few days... I did it with my 150 for my mbuna tank... let it sit a few days to evaporate the chem in the water then ran a filter from another tank and shuck the dirty filters in the tank... then three days later added 30 various size mbuna no problem... did a 55 the same with old gravel in two days...no problems...