Overfeeding fish can kill them by polluting the aquarium water. Too much food will result in too much ammonia produced in the aquarium one way or another. Ammonia poisoning is another leading cause of fish losses. Do not overfeed fish will save fish lives indirectly by keeping the aquarium water cleaner.

Poor water quality is perhaps the leading cause of all goldfish issues. A partial water change might be all it takes to give a goldfish back her appetite. If you’re keeping a goldfish in a bowl, upsize the environment to a 40-gallon aquarium for the first fish and 20 gallons for each additional fish.

If there’s too much food in the tank, a goldfish will most likely not be able to eat it all. Most of the damage from overfeeding comes from food rotting in the aquarium. Rotting fish food produces ammonia, which is toxic to goldfish.

Most fish need to keep moving even when they’re sleeping, so that they keep a constant flow of water moving past their gills to maintain a proper oxygen level in their bodies. For some larger fish, like sharks, this can take the form of swimming at a slower rate when sleeping.

Most nights, you can catch catfish, carp, and walleye whereas fish that rely on sight like pike, bass, trout, and yellow perch are caught primarily on full moon nights. Striped bass, though a vision-guided fish, are very light-shy and best fished for on dark nights with limited overhead moonlight.

Another reason fish become more active at night is because the water temperature begins to cool off. This is especially important in the summer months. During the heat of the day fish dive down deep to find the cooler waters. That is why most anglers target sunrise and sunset.

Any light under the water, no matter what the color, will attract fish. When lights are placed under the water, they reflect off particles in the water. These tiny little particles enhance a natural food source for bait. Once the bait fish are attracted, they bring in bigger game fish like snook, tarpon, and bass.

As it gets colder, though, fish tend to migrate in schools to deeper water. As the depth increases, temperature stabilizes and it’s easier for them to do their version of light hibernation. As an added bonus, fish of most species typically hold in tighter groups when the water’s cold.

Most aquarium fish are diurnal, meaning they move about during the day and rest at night. However, some species are nocturnal and prowl at night, spending daylight hours sleeping in a cave or crevice. (It’s probably safe to say aquarium fish don’t migrate unless you move their tank to another room or a new house.)

Aquarium fish do not need light and it is best that you turn it off during the night. Leaving the light on can cause stress to fish as they need a period of darkness to sleep. Too much light will cause algae to rapidly grow and make your tank look dirty.

Can fish sleep with a red light on? Yes, red lights are used to light the entire aquarium at night to observe the fish inside. It has been reported that fish cannot distinguish the difference between the color red and others, so using red light won’t affect their sleeping patterns.

Is Red Light Bad For Fish. For the most part, red lights are not bad for aquarium fish. Red bulbs are actually quite helpful since you can use them to observe shy nocturnal fish at night without stressing them. The light will encourage pigmentation in red plants as well.