I also recommend using prime. Occasionally I also use neutral regulator but I'm sure it is overkill.
As far as conditioning before or after goes I chose to use my 5 gallon buckets and let it sit with prime and neutral reg for a couple of minutes before adding it into the tank. It has worked for me for the last 4 years and I do 25% water changes about twice a week.
If you are using say a python to fill then dose half the tank then after filled dose the other half when done. If with buckets then dose the buckets before putting into tank.
I also recommend using prime. Occasionally I also use neutral regulator but I'm sure it is overkill.
As far as conditioning before or after goes I chose to use my 5 gallon buckets and let it sit with prime and neutral reg for a couple of minutes before adding it into the tank. It has worked for me for the last 4 years and I do 25% water changes about twice a week.
Typically, I add the conditioner literally right before I add the water. I just don't want to get caught up with a leak, a spill, trying to match temps or a phone call and then forget to add the conditioner.