What is the correct way to do a water change, in respect to vacumming the substarte? (not sure if vacumming in this right term, but i hope you know what i mean)
The guy at the local LFS
told me I should be "vacumming" the entire substrate as I siphon water out.
I have not being doing this, The only spot i "vacumm" is a back corner where I don't get good water flow. I then leave the rest of the substrate alone and just siphon the rest of the water out from the top.