Will your fish die from new aquarium cloudiness?

No, but cloudy water might signal trouble that could eventually harm aquatic life inside. This water might have an overabundance of tiny air bubbles from tap water, substrate debris, bacteria bloom, leftover algae remnants, overfeeding, or bacterial or parasitic infection outbreaks. While new tank cloudiness does not usually kill instantly on its own, it needs a watchful eye to keep your aquarium ecosystem steady and safe for its inhabitants.