I'm considering redesigning my and, like moving some of my lava rock around and laying some sand on top of my crushed coral. I have a question though, when I do a water change my LFS
mentioned that I could end up sucking up some of my sand if not all. He said that when I do a change I should get a strainer with very think wholes but I have yet to find one with holes smaller than the sand. Is there anywhere in specific I should be shopping for this? Or perhaps any other suggestions? And would I be able to mix and match different colors of sand? Or just stick with one color?