I recently purchased some rocks from A pet shop in town. It had dried maroonish colored algae on it. After placing the rocks in my tank it appears that the algae is growing very slowly. Does anyone know what this stuff is? and is it harmful or beneficial???
more than likely it is coralline algae which generally means your tank is doing well. It is a calcium based algae so most snails won't touch it so if you dont want it on your front glass you have to scrape it.
