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In the tropics, days and nights are of approximately equal length so 12 hours on and 12 hours off should be OK. For coldwater fish there can be more variation but i would advise that lights are not left on for more than 15 hours otherwise you are more than likely to have algae problems

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Q: Can a fish tank light be on all day and all night?
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What are all supplies needed for a 25 gallon fish tank?

Freshwater setup: MUST HAVE: Tank, filter, filter pads/media, heater, light, fish, water, electricity, fish food, place to put tank NICE TO HAVE: Substrate, decorations, tank lid


How do you get fish poop out of tank?

Use a syphon, a gravel vacuum, or get a crayfish because they just eat fish feces all night long.


How often should you leave on the light in a fish tank?

When I started my aquarium, the book I read recommended eight hours of artificial light a day. I put mine on a timer and actually only run it for six hours as the algae was terrible. Bear in mind, mine is a ten gallon fresh water tank, a salt water or living tank may be different. NO, fish are used to night & day, just like you! Turn it off when you go to bed or put it on a timer. Allow the fish to have some sleep. Light produce heat as a result of which temperature changes which the fish don't like when sleeping. Also, light disturbs the fish in sleep.


Do angelfish need light?

All tropical fish need light, as they tend to live near the surface around coral reefs. It is no different if the fish is kept in a tropical fish tank. Too much light duration will result in excessive algae growth in a fish tank. Therefore, light duration should be regulated to keep algae growth to a minimum.


Can you use a light bulb for a fish tank light?

Put it this way, a friend of mine uses her daylight bulb with her lamp, and puts it over the fish tank. I wouldn't use a 100w or 60w really, but all fish are different with their habitats. So i recommend seeking advice from a fish shop near you.


Will a black light create allege in your fish tank?

A black light configuration is completely safe for your fish. It's more recommended for aquascaped fully-planted aquariums, as it prevents algae blooms. If you do decide to use black light, make sure you have plenty of decorations that react to it, otherwise you won't have much use for it. I have a 45 gal. tank set up with a black light for night time, and a fluorescent for the day. It's cool to have less light coming from the tank, and when you stumble out to use the restroom in the middle of the night, and all you see is glowing fake anemones or plastic plants, its pretty awesome. =] Good luck, and happy aquascaping.


How can fish die while cleaning a tank?

depends on the size of the fish, there might not be enough oxigen in a small fish tank.


How do you clean a fish tank with grease in it and fish?

Scoop all your fishes to another tank or tub of water and clean the fish tank just as you would normally without the fish


What if you spill beer in a fish tank with fish in it?

All your fish will die. My buddy dumped a six pack in there and they were all dead in 3 hours...dont put beer in a fish tank


Does a light come with the top of a fish tank?

With some it does with others it does not. That all depends upon the retailer you are buying from.yeah mostly it does mine does.:)


What kinds of fish can live in a tank with power compact lights?

A Power Compact Light is basically the same as any other fluro light. It's just a slightly different shape from the long thin tubes that's all. Any and all kinds of aquarium fish will be OK if their tank is lit by power compact lights.


Is it correct to say a tank that belongs to several fish is the fish's tank?

That depends on what you mean to say. For example, if you have one angel fish in the tank you could say "That's the fish's tank" meaning that is the tank for the angel fish. If you also had a couple of clown fish, you could refer to the tank as belonging to all three fish by saying "That's the fishes' tank." Slightly different spelling and punctuation