This question aquarists ask quite often, it is especially popular among beginners. Often this is due to the peculiarities of the daily routine of the owners of the aquarium. For example, a person needs to work at night. Naturally, at least some light, but included, and the owner often worries about their Pets. Did he disturb their sleep? Anyway, don’t worry, aquarium fish.
Immediately want say-Yes, fish sleep. But not in the ordinary human sense. If a person during sleep, the brain almost ceases to respond to the surrounding reality, then the fish just slow down the physiological processes in the body. At the same time, they respond perfectly to the slightest changes in the situation around them. Whether it is extraneous noise or light / shadow fallen on the aquarium. Continue reading