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Starve your plants, and you will grow algae. But is the opposite true, can one feed the plants and avoid algae growth? When we begin growing planted aquaria, many of people are having aquarium fish tanks without plants and avoid having any phosphate or nitrates, both that benefit fishes. We can also
apply minimal lighting
that is just enough to make the
fish pretty but not enough to help algae flourish. These practices can
lead to problems in a planted aquarium that create algae blooms that seem
persistent and incurable. |
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The E.
parviflorus sword plant
(above pic) grows to
only about 6 inches if given plenty of light (more than 2 watts
per gallon of high-quality fluorescent lighting). It is a sword suitable for the foreground in many aquascapes.![]() Java fern can grow above the water due to more CO2 at the water surface than below. Aquatic plants that can reach up to the surface will enjoy plentiful of CO2. Under low lighting conditions, there will not be much photosynthesis going on, but some algae will persevere; and if the higher plants are not using up nutrients, there are more nutrients around for the algae to bloom. It is easier to avoid algae in a tank planted with plants than a fish-only aquarium, if you try to treat a planted aquarium like a fish-only tank, your experience will be just the opposite. We would not dream of trying to keep fish in an aquarium with little or no food or without a balanced nutritional diet. While many novices tend to overfeed the fish in their fish-only aquaria, the opposite extreme--lack of nutrition--is a certain course to failure and starvation does not promote good health. The same apply to aquarium plants. They need a relatively balanced diet. And some things we try to avoid in fish-only tanks, namely phosphate and nitrates, are essential in a planted aquarium. Does this mean fishes and plants need opposite conditions? Absolutely not. The amount of phosphate and nitrate that plants need is well below the levels that would ever harm fish. Good plant nutrition calls for roughly 10 ppm of nitrates and 1 ppm of phosphates (for more information on this, see my column "Fuzzy Sword"). If you starve plants, they will use up the store of nutrition that they built up while growing at the nursery. They may initially look very nice, yet after you bring them home, they will weaken and succumb prematurely if you starve them by not providing adequate phosphate and nitrates. The small amounts of nutrients in the water will be used by one of the many types of algae that can grow in an aquarium. Often fish food is not enough therefore, plant nutrient supplementation is necessary. |
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Starve your plants, and you will grow algae. But is the opposite true, can one feed the plants and avoid algae growth? You can avoid new algae, but algae already in your aquarium will use the nutrients just like the plants will. You need to clean out the algae and keep feeding your plants. Tanks free of algae tend to stay that way if there are many healthy, well-fed plants in them. Grow your plants to avoid algae, although it is not a perfect end to algae because algae spores are all around in your aquarium and cannot be avoided. Moreover, you have to do water changes often enough to control the level of organic compounds that develop in the water. How often depends on the fish load, but 50 percent once a month is a good rule of thumb in a slow-growing planted aquarium, and 50 percent weekly is a good rule of thumb for fast-growing aquaria with more than 2 watts per gallon of lighting and added CO2. Clean up what algae that appear and give your plants the nutrition they need. Algae will become one of the things you rarely think about, and you and your fish will have a beautiful garden to enjoy. |
Healthy Plants Require Balanced Growing conditions. An unbalanced planted aquarium need a high level of lighting without adding carbon dioxide. How can I control the algae? My pond water becomes murky and over loaded with algae. My 10 ft X 5 ft pond contains six Koi fishes about 2 ft in length uses pH of about 7.0 rain water. Using yeast fermentation bottle. You only need a couple of bottles to maintain good CO2 levels in a 92-gallon aquarium--great for growing fresh water aquarium plants and won't hurt your fishes. Freshwater Java fern (Microsorum pteropus) can suffer from Java fern melt if blue-green algae is present due to nutrient deficiencies. Water Hardness, black or red algae affect your aquarium. Some sword plants growing from a riverbed that was pure calcium carbonate--yet, the swords were flourishing. CO2 is only a problem for fishes if you add too much to the water. A good level for plants is about 20 to 30 ppm. CO2 doesn't stress fishes until the level gets to be about 50 ppm (parts per million). |
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