Well, I bought a few bags of PFS and I'm rinsing and adding them today. Do I have to drain the aquarium first? I don't want to because I've been carefuly cycling it and I don't want to mess anything up by adding a bunch of new water, but I don't have a bucket big enough to store 180 gallons of water taken out of the aquarium either. If I rinse it good can I just pour it in if the filter is off, won't it settle pretty quick?