How to maintain a large fish tank ecosystem

- May 20, 2020-

To maintain the large-scale fish tank ecosystem, the first thing is to clarify which key elements are missing from the large-scale fish tank, and whether the ratio between the placed elements is appropriate. The fewer the missing elements, the closer the proportion of each element is to natural conditions, and the less maintenance work is required; otherwise, it will take more effort. Two specific examples will be described below.


Method/step: Set up a "bare tank" for pure fish farming with only submerged biochemical filters

Here, in addition to the lack of plankton mentioned above, there is also a lack of scavenging benthic animals and higher aquatic plants that can absorb waste to make oxygen; in addition, this tank needs to achieve a fuller ornamental feeling, stocking fish The density often reaches the upper limit that the filter can bear, which means that the ratio of bacteria to fish is close to imbalance. To maintain such a fish tank, in addition to daily feeding, we must regularly suck out the bait and feces at the bottom of the tank (instead of benthic animals and water plants, benthic fish such as pipa can partially replace this work), more frequent water changes to dilute Hazardous waste (replaces the function of aquatic plants to make up for the lack of bacteria. In this case, without the help of aquatic plants, it is difficult to remove all waste even if the biofiltration is running at full load). When the water temperature is high, an air pump is also needed to pump (replace the aquatic plants) The function of making oxygen). Of course, the stocked fish species also have a lot to do. If you keep a dragon fish in a 300L tank, you don’t have to be so troublesome, just remove the bait and feces every day; but if you are raising a large group of colorful, these operations It becomes a required homework almost every day.


In a tank with a biochemical filter, bottom sand, a lot of water plants, algae-eating shrimp and a small number of fishes, it seems that all the main elements are complete except plankton, so it’s okay to feed Can it be done? Indeed, the maintenance work of this large aquatic ecological large ornamental fish tank is less, but it is not to say that it is complete. In fact, the ratio between the various elements of this system is seriously unbalanced-there are too few fish and very little metabolic waste. The water plants and bacteria are relatively excessive, so the whole water body shows "negative eutrophication", which is good for inhibiting algae and promoting fish health, but it is not a good thing for water plants and bacteria. They will be due to malnutrition. It tends to be weak. If you don’t intervene in time, the whole system will be disintegrated due to the apoptosis of aquatic plants, and the hard-working aquarium beauty will no longer exist. So we add various fertilizers, add carbon dioxide, add nitrifying bacteria... In addition, due to the lack of herbivores (this is what we avoid introducing large ornamental fish tanks of aquatic plants), the growth of aquatic plants is not controlled, we need regular pruning and removal Withered leaves, truncated stems that are too long, adjust growth density...