Goldfish usually react positively to having a light source, however it is unhealthy to leave your fish tank illuminated constantly and the light also encourages algae to grow rapidly. Eight to twelve hours a day is sufficient for a happy goldfish.
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If a Goldfish is kept in a dark place for an extended period, it may become stressed and disoriented. Lack of light can disrupt their natural behaviors, affect their circadian rhythm, and lead to health issues like decreased immune function and loss of color. It is important for Goldfish to have a day-night cycle to maintain their well-being.
Most living creatures that are not nocturnal will eventually suffer badly if they are kept permanently in the dark. It has been reported that a goldfish will loose its colours if kept in the dark.
It would die.
it would just keep growing.
A nursery is a place where small plants and saplings are kept and grown for transplanting.
A bean seedling kept in dark develops chlorosis and its leaves become yellow.
Goldfish and angelfish have different temperature, water quality, and space requirements, making them incompatible tankmates. Goldfish are coldwater fish that produce a lot of waste, whereas angelfish are tropical fish that prefer warmer temperatures and cleaner water. Additionally, angelfish are known to be more aggressive and may nip at the fins of goldfish. It's best to keep them in separate tanks.