Composite FISH image of activated sludge. Yellow = "Competibacteraceae"; Blue = Ca. Accumulibacter; Green = other cells. Scale bar = 10 microns. - Source:1
Never detected in activated sludge 2. No information specific for the clade, although the family is known for exhibiting the GAO phenotype.
 McIlroy SJ (2010) Phylogenetic Diversity and Ecophysiology of Alphaproteobacterial Glycogen Accumulating Organisms in Enhanced Biological Phosphorus Removal Activated Sludge Systems. PhD Thesis La Trobe University. - Mcilroy -
 McIlroy, Nittami, Kanai, Fukuda, Saunders, Nielsen, et al. (2015): Re-appraisal of the phylogeny and fluorescence in situ hybridization probes for the analysis of the Competibacteraceae in wastewater treatment systems. Environ Microbiol Rep 7(2): 166-74. doi:10.1111/1758-2229.12215