Saltwater Aquarium MaintenanceForum for the discussion of maintenance practices in a Saltwater environment. This includes questions on testing parameters, performing water changes and top-offs, cleaning algae, replacing substrates, moving tanks, and any other maintenance related tasks for Saltwater aquariums.
i have a new tank going through its cycle and there are pockets of air bubbles in the sand, against the glass. they kinda look like gray pockets from a distance. is this nitrogen?