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When my tank was first setup I would get sandstorms when I moved stuff. However after a bit the biofilm builds up on the sandbed. This weighs it down a little more and you shouldn't get that sandstorm effect anymore.
So then, in my recent sand storms, I have collected a bit of sand in my back compartments in my biocube. Is there anyway during the water change that I can get that cleaned as well?
You gotta measure what you take out...I use 5gal buckets so if you take out 5 gal put 5 back in and you may wanna get an extra gallon when you water change in case you need more, always better to have too much than not enough. Your biocube should have a window on the side that says min and then max I fill mine a couple inches above max