Providing a Good Habitat
Get a large enough tank. In the aquarium world, the knifefish is a large fish that needs a large tank. It is suggested to use a minimum of a 125-gallon tank for a single knifefish. You should do 30-50% water changes each week. The knifefish will spend most of its time in the bottom of the tank.
Keep that water warm. The temperature your tank should be between 73 and 83 degrees Fahrenheit (22.8-27.8 degrees Celsius). You will need a tank thermometer to tell the water temperature inside the tank. A tank heater may be needed (depending on where you live) to get the water to an acceptable temperature range. If the water temperature is under 73 degrees Fahrenheit (22.8 Celsius), The fish could become sluggish or to lose its appetite.
Keep the pH between 6.0 and 8.0. To find the pH of the tank you will need pH strips.
Use a fine gravel substrate. The substrate should be either sand or gravel to replicate the knifefish's natural environment. The substrate needs to be fairly soft to prevent harm to your fish.
Provide many hiding places for your fish. Whether your decorations are plants, rocks, or wood, you should have many decorations to help your knifefish feel secure. Some owners have a clear tube in the tank so the owner can see the fish but the fish still feels secure.
Choose a good tank mate. Choose a tank mate that is about the same size as your knifefish. These fish are peaceful to other fish that are the same size as them but, can become aggressive with other ghost knifefish. Make sure your tank mate isn't too small so it isn't mistaken for a meal.
Use a water pump. Coming from the Amazon river, knifefish are used to moderate to strong water flows. A good water flow gives your fish mush needed exercise to keep it healthy.
Use minimal lighting. Knifefish are nocturnal and used to hunting in the dark. During the day, use none or very little light. At night, use some low-level lighting so you can see the fish when its active.
Have a strong filter. Make sure your filter can any and all waste and impurities. Knifefish are very sensitive to things in the water like ammonia, nitrites, and nitrates.
Feeding
Feed live food. In the wild, the knifefish eats insect larva, insects, worms and small fish so replicate this diet in your tank. To replicate the diet you can use foods such as: Brine shrimp Bloodworms Blackworms
Feed daily. Once acclimated, your knifefish should come out for feeding. If you see that your fish is shy, feed it multiple times a day to help it get used to coming out. These fish are one of the few fish that you can hand feed. Hand-feeding requires a good bond between the fish and the owner so don't expect to be able to right away. When hand feeding, make sure that you don't have any soaps or perfumes on your hand because these are toxic to fish.
Only feed it healthy fish/insects. Sickness can be transferred from anything from plants to feeder food. Make sure to properly quarantine anything that you add to your tank and to only buy your food from reputable sources that you trust. Knifefish are prone to skin flukes, parasitic infestations (protozoa, ichthyobodo, worms), bacterial infections, and bacterial diseases.
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