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Fish, especially in a new environment, are very excited when you approach their tank, and it’s tempting to feed them more than they need.
The problem is, fish only need a small amount of food, and they will eat more than they should if given the chance.
Overfeeding means uneaten food settles at the bottom of the aquarium and starts to decay. This creates excess waste, high ammonia, and dirty water.
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.