Method to add the newly purchased fish

Water adjustment is essential before adding the newly purchased fish to the aquarium. Firstly, check and compare the pH of the tank water and the water of the bag containing the new fish. If the difference in pH is not big, float the new fish within their bag in the tankwater for about 10-20 minutes in order for them to adjust to water temperature in the tank.


The impact on the fish is less severe if they are kept inside the bag placed in a pail during water adjustment. If there is a difference in pH, slowly add the tank water to the bag with an air tube using siphoning principles. When the water level of the bag has almost doubled, check the pH again to make sure there is no difference in pH.

Give the fish medicine when they get sick

When the fish get sick, we must give them medicine. Fish medicines that can be used in the planted aquarium are very limited. Some examples of fish medicine that can be used with no impact on the aquatic plants include Aguten which is malachite green solution (against white spot disease and water mold infection) and Parazan D containing oxolinic acid (against germ diseases). However, if activated carbon is in use when these medicines are given, the effects will be wasted as it is absorbed by activated carbon. Avoid combined use of fish medicine and activated carbon.

Using stress coat water conditioner

The body surface of the fish is usually protected by mucous membrane. However, some fish just brought from the shop may have damaged bodies due to friction with some other matter. When a large amount of tank water is changed, the mucous membranes of their body surfaces may be lost due to the inorganic matter contained in tap water. In these events, add API Stress Coat Water Conditioner containing the healing power of aloe vera that protect the mucous membrane of the fish.

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Add 5 ml Water Conditioner per 10 U.S. gallons (38 L) of aquarium water

Using the right net in the right way

For the net used for adding or scooping the fish, it would be useful if you have several types with different net and mesh sizes. When using a net, you should get things done as quickly as possible to avoid possible damage to the fish body surface caused by the net. To scoop up a fish, prepare two nets of different mesh sizes. You can easily catch a fish by using the fine-mesh net to chase the fish into the coarse-mesh net.

use the right net to catch aquarium fish

Fish seem to become more responsive when they are chased with a fine-mesh net.

Feeding the fish with the right types and amount of food

You should feed the fish slowly while watching them snatch their food. When vigorously eating fish slow down, it’s time to stop feeding. For the mixed fish aquarium, however, some fish swimming at middle to bottom levels may have not taken enough food and need to be observed carefully.

Fish food floats at the water surface first and then sinks slowly. This allows fish at every level of the aquarium to get their food. If you drop fish food as if you are throwing it onto the water’s surface, the food can reach the fish swimming near the middle and bottom levels faster.


The important points in fish feeding is to watch and see if all the fish become full or not. Most of the fish aggressively snatch their food when they are hungry but they slow down as they get full. If this change in how the fish eat is observed, the feeding should be stopped.

Idea to prevent fish jump out the tank

prevent fish jump out the tank

Place a set square at the corner where the water flow usually changes.

What we need to be careful of in an open-style planted aquarium is the fish jumping out of the tank. In addition to being watchful of the typical fish such as killifish and Hatchet fish who have a habit of jumping out, we should know that any type of species could jump out of the tank due to changes in the environmental after water change and a few days after they have been newly added to the tank. You may avert this problem just by placing a setsquare at the corner of the tank.

Male guppies sometimes jump out of the tank when they aggressively chase the females.

African lampeye jump out of the tank when they are surprised

Hatchet fish have the propensity to jump out of the tank.