Hi im new to this site but have been keeping fish for roughly 5 years, the thing is im moving house and in the process i am goin to change the backdrop of my tank. I work on building sites and saw some roof slates in a skip, so i helped myself to a couple of bags
now i know i cant just put these straight in to a tank and put the fish in so is there any type of cleaner that would be safe to use that doesnt kill any fish? Many thanks Mark