Well I rinsed it real good and it didnt smell after that. The water smelled horrible though. I think the plankton or pods must have died and caused the smell because the cheato was nice and green except for a few white areas and had a sweet plant kinda smell. So I took a chance and put it in the refugium and it seems to be just fine. It is the thin kind and yeah your right I do prefer the stiffer thick type. I have two tanks and my 125 gallon has the thicker stuff, hopefully I wont need to purchase anymore!! Thanks for the help, Carrie