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Some fries can die off within 8 hours without food. However, some of them use egg yolk as food & live up to 3-5 days
At winter season goldfish eat very little. During this time it can skip meals for weeks
Either cichlids become timid or become territorial if they don't get food for long time.
Koi can live unfed for months during winter season but can't live for weeks during summer due to high metabolic demands
The vibrant body color start getting fade if betta are unfed for several days. They become sick too.
Danios are not fussy eaters so if they are not getting external foods then they can manage appetite by eating insects & all
Tetras should not be unfed for long time. They become week quickly. However, neon tetras can live more than other tetras without food
Despite being a strong fish, flowerhorn should not be kept unfed for a long period of time.
Food habit of glofish is like danios & barbs. They become timid if they don't get quality nutrition