I took all the fish out and placed them in a large Tupperware container and I placed the filter and heater in there as well.
Empty out as much of the water as you can with a siphon or whatever. Once you only have substrate left, the easiest thing to do is suck it out with a shopvac. Make sure you keep a good few cups worth of the old substrate aerated and wet so the bacteria doesn't die. I took that old substrate and put it in a sock then an leaving it in the tank to help transfer the old bacteria over to the new substrate. Worked perfectly cuz I didn't have a cycle! Yay!
Next is add your freshly washed sand. It's quite easy and make sure it's clean. Drop in your sock of old substrate and fish, filter, and heater. Bingo!
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