I have algae in my tank which I cannot seem to ID. It is spreading despite scrubbing with peroxide. At first I thought it was bryopsis, but it doesn't have the typical feathered plumes. The close ups are taken with a microscope camera and appear more red than they look with the naked eye (picture of rock with mushroom). Does anyone know what it is and how I can treat it? Peroxide is not doing the job as efficiently as I would like it to.