I have got the following:
2- 10g tanks
2- thermometers
2- heaters
2- nano powerheads
10 - various pvc pieces
1 - air pump
lots of airstones, air tubing
I only put about 7g of water in the 10g tank. Set it all up (heater, thermometer, airstone, pvc, powerhead) and put the fish in. I used to use an ammonia alert, but have never had ammonia show up in 3 days. Just to be careful, I usually put prim in sometime during day 2.
On day 2, I set up my other aquarium to let it age for a couple of days before the transfer.
On the morning of day 4, I transfer the fish. I do this by lowering the water level to a couple of inches, then I catch the fish in tupperware. Take the top, and put it on loosly and drain all of the water out. Then I drop the fish into the next tank - at most a couple of drips of water follow.
I start the decontamination process immediately. I use a spray bottle with a 15% solution of bleach in it. I spray everything with a thick coat of it - inside and out. This includes the tank, the powerheads taken apart, the tupperware - everything. The air hose and airstone are thrown away and replaced each time. I let the bleach sit for about an hour and then rinse really good with tap water. I then fill up the tank with tap water throw everything into it and add about a cup of vinegar. I also assemble the powerheads and turn them on during this part. Let that run for about 2 hours, and then rinse everything and dry them out.
On the "second" day 2 I assemble the tank again and age the water . . .
That is how I do it.