If I understand your question, yes it is likely that different species and different biomass (either more or less) of algae may colonize concrete surfaces than those that colonize natural surfaces such as sediments or stones. In addition, if the concrete has a different texture (rough or smooth, presence of crevices, etc.) that will also affect the quantity and composition of algal assemblages. Here are a few good articles on the subject.
Murdock, J. N., & Dodds, W. K. (2007). LINKING BENTHIC ALGAL BIOMASS TO STREAM SUBSTRATUM TOPOGRAPHY1. Journal of Phycology, 43(3), 449-460.
Dudley, T. L., & D'Antonio, C. M. (1991). The effects of substrate texture, grazing, and disturbance on macroalgal establishment in streams. Ecology, 297-309.
Tuchman, M. L., & Stevenson, R. J. (1980). Comparison of clay tile, sterilized rock, and natural substrate diatom communities in a small stream in southeastern Michigan, USA. Hydrobiologia, 75(1), 73-79.
Sir We have found an cyanobacterial habitat within the rock surface. i.e. when i scalped out the upper surface of rock a thin greenish glittering mosse layer appear. it look like painting, i collect it and observed under microscope. it was heterocystus cyanobacteria.