Originally Posted by Guppyman34
So I was thinking because my substrate is all gravel, I'd add some aquarium sand to a spot where there is less gravel, specifically for my cories. Because I already have fish in my tank, can I still add some sand?
Yes, you can save money too by going to a pool store and picking up pool filter sand for 8-10 bucks. It is silica sand an is inert, will not change your water chemistry. Clean the dust out in a bucket, turn off the filter when you add it. Any dust should settle in about 15 minutes. The filter will not sick it up unless you practically poor it near the intake while it's on. Good luck!