Hi everyone! *if you want to skip some stuff that doesn't necessarily apply to my question skip the paragraphs talking about taking the gravel out of the tank and cleaning the sand* I am switching from the standard Walmart gravel to some play sand that was in my old child's sand box in my freshwater aquarium soon. I have been doing a lot of research, reading, watching videos, and basically attaining any information I can get a hold of about how to switch the gravel to sand and then once the sand is in the tank, how to clean it. I have come across a lot of great information but there are a couple things that are a little different with a couple articles and videos that seem to contradict each other. Here is what I found: To get the gravel out of the tank: Mix the gravel well while it is still in the tank water so all the waste float up into the water. Scoop all the gravel out of the tank. Let the waste sink back to the bottom of the tank then siphon all it out to leave a fairly fish waste free tank as well as as much water you intend to replace with sand. This is happening while your fish are still in the tank. When cleaning the sand: Rinse it extremely well many many times in a bucket with a hose till the water runs clear...and then rinse it some more. Bake the rinsed sand in oven at 200 degrees for 20+ minutes. Scoop sand in a container and slowly sink the sand filled container slowly and dump at the bottom of the tank. Then spread the sand out so there is about 2 inches of sand covering the bottom of the tank. Cleaning the Sand: (Here is where the info started to seemingly contradict itself and I couldn't decide which was better. Keep the idea of the gas pockets developing under the sand when you read this.) 1) Siphon the sand by hovering it over the sand to pick up waste but don't plunge it in the sand and then lightly rake the sand to release any air bubbles. 2) Rake and turn the sand over well to make the waste float up into the water, then siphon the floating waste out of the water. Ok wouldn't "2)" cause bits of waste to get trapped under the sand and cause those air pockets to develop? Why was that an option for a way to clean the tank. Wouldn't that just make it more dirty? Can someone clear that up for me, or does anyone have any personal preferences on how to clean sand? Thank you all so much and so sorry for my really long forum question!!! Thank you for your patients for reading my really long thing!