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There can be various causes but, most recently, a reservoir in Texas turned red due to an overpopulation of Chromatiaceae bacteria. That was a result of the severe heat and drought conditions which have been continuing for many weeks, causing the oxygen levels in the water to become very low.

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Yes, there are some types of bacteria that carry out Anoxygenic_photosynthesis, which consumes carbon dioxide but does not release oxygen.

Examples include, but are not limited to: Chromatiaceae and Ectothiorhodospiraceae.

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