When I received this product I washed it down and let it dry a couple times with RO water, after putting it in my aquarium I lost 3 perfectly healthy fish over a 2 day period, all were fish that decided to inhabit the decoration, so immediately thought to remove it, upon removing it I noticed a strong chemical smell coming from it, almost a burnt/melting wire smell which was quite odd, while getting it out I also noticed my water smelled the same as this item, which definitely did not smell likeSee full review