I have a 5 gallon tank at home on my desk. The look i was going for was the natural one, no filters or anything (aside from a heater). Low bio-mass and some plants. My water was pretty green for a while so i did weekly-biweekly water changes for a while. Then one day my water was just crystal clear and it has remained that way for nearly a week now.
What would cause this? I assume the tank has hit some sort of equilibrium? Should i be concerned?
All fish need a filter no matter what people will tell you. Even a small one is better than nothing. The water could be clear because of an ammonia spike, You may want to get the water tested. But i would definetely get a filter to help your tank last longer.
People who need green water for feeding to rotifers or daphnia or very small fish fry have to work hard at keeping the green water around. All it takes is for a few rotifers to get into the green water for it to all be eaten up and their efforts all gone to waste.
Rotifers are nearly microscopic animals that when they were first discovered, early microscopes seemed to show that they were equipped with wheels. Better microscopes revealed that they actually had round patches of cilia, whip-like hairs that they propel themselves with. At low magnification these patches appear to be spinning wheels. They can be ordered from scientific supply houses or you can wait until a few eggs of them float in on a speck of dust.
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That last was your method I think.When green water disappears "in one day" it is nearly always because of rotifers. Now that they have eaten all the green water, nearly all of the rotifers will go dormant. Some plants such as Pistia stratoides, the floating shell flower, have very fine roots hanging down in the water that often transport rotifers from place to place.
