johnsmb Posted November 2, 2010 Share Posted November 2, 2010 I am in the process of setting up a 40B tank. In the meantime I have a simple 15 gallon tank with about 20 pounds of liverock and some corals. It has been up for about 3 months or so. No skimmer, no sump, no fish. It has a lot of bubbles in the tank. All the time. There is a small amount of red hair type algae on the back wall - but there is no algae on the rocks at all. No slime type of algae. The bubbles seem to form mainly on the underside of the rock and then eventually release and then float up to the top of the tank. There is constantly a lot of bubbles floating up to the surface. What is this? Something bad? There are some nitrates present, probably because I am only using RO water while I wait for my ro/di unit..... Beth. Quote Link to comment Share on other sites More sharing options...
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