Noob question here. I've been reading up on mixing up my own water and saw that some mixes say don't mix more than 4 hours (or what ever depending on the brand). I have been buying my water from my LFS store and I have been dumping my buckets into my garbage can and throwing in a small pump and heater the night before so I'm good to go in the morning for my water change. Should I not be putting in the pump? My garbage can is clean and residue free when I'm done.