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Regardless of the reward offered by the Red Bacteria, it is possible to increase it by watching a short video ad.
After the watching the ad, there is a cooldown of approximately 1 hour, where Red Bacteria ads are not available and it's possible to select only the free reward. The cooldown for Red Bacteria ads is in no way related to cooldown for other ad types.
If you have anthe ad-free version, then you can receive the better reward without watching ads.