I don't have the money to do this right now but it is something I would like to do in the future. I would like to set up a tank with sand in the bottom and a layer of amethyst crystals on top. Would the points of the crystals be too sharp for the fish. Any suggestions on other decor. Is this an absolutely insane idea that would have an end result of a lot of dead fish. I wasn't sure which forum this should go in so I put it in here. I have a 29 gal and I am planning on setting up a small 10 gal as a quarantine tank. would this be a bad set up for a quarantine tank in particular. I think it would because it would be difficult to keep clean. Still i think it would be beautiful so if i can do it i would like to. I'm looking forward to your comments.