Today, while browsing the dollar store, I saw some rocks that I thought would look fabulous in the new 10 gallon I'm planning on setting up for my two boys.
However, when I got home, I noticed they were labeled as "polished". Will these be okay? I boiled them and a sort of film formed on the top of the water (looked kind of like oil). I dunno if I trust putting them in the water or not.
Could they hurt my fish? If they could, where can I get some medium sized (like 3/4"-3") natural looking river stones?