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Notes
Different fish have different temperaments. Aggressive fish can nip fins, chase others, and dominate the tank. Timid species will hide all the time or stop eating if they’re constantly being bullied.
Tiny changes in water chemistry, overfeeding, or even picking the wrong combination of fish can throw everything off balance. Unlike a houseplant that might just wilt quietly, a struggling aquarium is much harder to ignore and often much harder to fix once things go wrong.