In my 80 gallon, I have a small section that currently has white sand. There is a river rock boundary that keeps the sand where it needs to be. My idea was for it to look like a section of "beach". What a bad idea. The sand now looks terrible and I want it out of there. Here's my question. Can I just gravel vac it out during the next water change and just place regular gravel substrate in its place? There are fish in the tank and I don't know if that's a concern or not. They are not skittish fish at all. In fact, I can't keep them away from my hands or my gravel vac when I do a water change. My idea was to place gravel in a measuring cup and gently pour it in the area where the sand is. I'm just not sure if the noise will disturb the residents. I'm planning on doing this tomorrow (Friday) night so if this is a bad idea, please let me know. Thanks!