What would be the cause of an alge outbreak over nite?All decorations and rocks turned green over nite.
Size of tank and temperature?
What is your cleaning schedule, water changes, how much and how often?
What is your feeding schedule, how much and how often?
How long you keep your lights on regularly?
Have you tested your tap water for phosphates? High levels phosphates could increase algal growth.
What fish do you keep?
What kind of filter do you run?
A lot of questions I know, but it will help us understand your situation much better.
The light comes on about 5AM till about 9PM.
Could you answer the questions listed above?
I'd say that is a rather long duration to have your lights on as well. 8-10 hours should be the max. Do you have plants? I read an article that said it has been studied that fish produce the ideal level of vitamin D in only 6 hours of light. Anything above 10 hours is a waste of energy in my opinion, and could furthermore contribute to algal problems.
The next big question is the amount of nutrients dissolved in your water. And that could be answered with how much you feed and how often, and your phosphate level.
Oh and it wouldn't hurt to answer the other questions.
I leave mine on 5-6 hours tops.........unless you have certain plants you dont need much more than that..........if you want to be able to observe without the main lights, look into some LED moonlights.......
i got these for my tank..........
they have other sizes also........
Although lighting may have something to do with your problem, I feel that is caused by excess nutrients in the water. An over abundance of phosphates and other nutrients, usually caused by over feeding, are the culprits, in my opinion. I have a couple of tanks that the lights remain on for over 14-16 hours a day and I have no algae problems what-so-ever.
There are a couple of ways to combat the problem. One is to cut back on feeding and increase the frequency of water changes, 25% once a week(more if necessary). The other, is to get plants that will out compete the algae for nutrients. I would use elodea. It is inexpensive and will soon put the algae in its place. It is a floating plant, normally, and would add a little security for your fish. Thirdly, and least suggested, would be to use an algaecide. I would only use this method as a last resort.
Still a little more information is needed about how much is being fed to the fish and how often, and I still believe phosphate levels could be playing a role in this.
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