How To Catch Fish In A Planted Aquarium – Pro Techniques

We have all been there: you have spent months perfecting your aquascape, and now you need to move a specific fish. Whether it is for medical treatment or rehoming, the thought of chasing a fast-moving tetra through a forest of Rotala is enough to cause any hobbyist a bit of anxiety.

I promise you that learning how to catch fish in a planted aquarium does not have to result in uprooted plants or stressed-out livestock. In this guide, I will share the exact strategies I have used over the years to outsmart even the quickest fish without ruining a beautiful layout.

From the “two-net” strategy to specialized traps, we are going to walk through every step to ensure your fish stay safe and your plants stay firmly in the substrate.

Why Catching Fish in Planted Tanks is a Unique Challenge

If you have a “bare bottom” quarantine tank, catching a fish takes about five seconds. However, a planted tank is a maze of obstacles including driftwood, dragon stone, and dense foliage that provide infinite hiding spots.

The main issue is that fish perceive a net as a predator. In a high-tech or heavily planted setup, they can dive into the carpet or disappear behind a large piece of hardscape where your net simply cannot reach.

When we try to force the issue, we often end up swinging the net wildly. This not only stresses the fish but can lead to “aquarium chaos,” where your substrate gets kicked up and your delicate stem plants are snapped.

Essential Tools for the “Patient Aquarist”

Before we dive into the techniques, you need the right gear. Using a giant, stiff net in a 10-gallon nano tank is a recipe for disaster.

1. The Right Nets: You should always have two nets of different sizes. A larger, fine-mesh net acts as the “catcher,” while a smaller net acts as the “herder.” Look for nets with soft, dark mesh, as fish can see white mesh more easily.

2. Specimen Containers: Sometimes called “hang-on-tank” boxes, these are great for holding fish once caught. They allow you to keep the fish in the same water while you prepare their next destination.

3. Feeding Rings or Glass Jars: These are essential for the “trap” method. A clear glass jar can be an invisible trap that fish swim into without realizing they are being confined.

The Two-Net Method: The Gold Standard

This is my go-to strategy for almost every situation. The biggest mistake beginners make is trying to “chase” a fish with one net. Fish are faster than you, and they can feel the water pressure of a moving net.

First, place the larger net in a stationary position against a flat surface, like the glass or a large rock. This net is the “goal.” It should stay perfectly still so the fish stops viewing it as an active threat.

Next, use the smaller net to very slowly guide the fish toward the large net. Do not make sudden movements. Think of yourself as a shepherd gently nudging a sheep into a pen.

Once the fish swims into the mouth of the large net, quickly but smoothly lift it toward the surface. By using two nets, you eliminate the “chase” and rely on the fish’s natural flight path to do the work for you.

How to Catch Fish in a Planted Aquarium Without Tearing Up Plants

If your tank is a “jungle style” setup, you might feel like catching a fish is impossible. However, there are ways to modify the environment temporarily to make the process easier.

Lower the Water Level: This is the single most effective “hack” for catching difficult fish. By draining 50% to 70% of the water, you drastically reduce the vertical space the fish has to escape.

When the water is low, the fish can no longer swim over the tops of your tall stem plants. They are forced into the open areas, making the two-net method significantly more effective. Plus, this is a great time to do a large water change!

Remove Decorative Hardscape: If you have a specific piece of driftwood or a cave that the fish always retreats to, consider removing it temporarily. Just be careful not to crush any shrimp or snails hiding underneath.

Use the Glass Corner: Use the corners of your aquarium to your advantage. Fish often feel trapped in corners, which makes it easier to “box them in” with your net. Just ensure you aren’t pressing the net frame against the glass too hard, as you don’t want to pinch the fish.

The “Night Shift” Strategy: Catching Fish While They Sleep

If you have a particularly elusive species, like a Kuhli Loach or a fast Danio, catching them during the day can be nearly impossible. This is where the “Night Shift” strategy comes into play.

Wait until the aquarium lights have been off for at least two hours. The room should be completely dark. Use a dim flashlight or your phone’s light to locate the fish.

In the dark, many fish enter a state of “torpor” or rest. Their reaction times are significantly slowed. Often, you can simply scoop them up before they even realize what is happening.

Be careful not to shine a high-intensity LED directly into their eyes for too long, as this can cause them to bolt in a panic. A quick, decisive scoop is the key to success here.

Building a Simple DIY Fish Trap

Sometimes, manual catching just isn’t working, and you don’t want to stress the entire colony. In these cases, a trap is your best friend. This is a passive way of how to catch fish in a planted aquarium.

The Plastic Bottle Trap: Take a standard plastic water bottle and cut the top third off. Flip the top part around (the nozzle side) and insert it back into the bottom part of the bottle.

Place some high-value food inside, like frozen bloodworms or a sinking wafer. Submerge the bottle in the tank, ensuring there are no air bubbles trapped inside.

The fish will follow the scent of the food through the small opening but will struggle to find the exit. Once the target fish is inside, simply lift the bottle out. This method is incredibly safe and virtually stress-free for the aquarist.

Catching Specific Species: Tips and Tricks

Different fish require different approaches. A bottom-dweller behaves very differently from a surface-dweller.

For Bottom Dwellers (Corydoras, Loaches): These fish have sensitive barbels and often “dart” into the substrate. Use a wide, flat net and try to slide it under them rather than coming from above.

For Fast Schooling Fish (Tetras, Rasboras): These fish rely on “safety in numbers.” Try to separate the target fish from the school first. If you try to catch one in the middle of a group, the collective panic will make it much harder.

For Territorial Fish (Cichlids, Gouramis): These fish often have a “home” spot. If you place the net near their territory and wait, they may actually swim into it to “defend” their space or investigate the intruder.

Minimizing Stress After the Catch

The process of being caught is the most stressful event in a fish’s life. Once you have successfully caught the fish, your job isn’t quite over yet.

Check for Injuries: Quickly inspect the fish for any torn fins or loss of scales. If you used a soft mesh net, the risk is minimal, but it is always good to check.

Keep them Submerged: Whenever possible, move the fish from the net into a container of tank water immediately. Avoid keeping them in the air for more than a few seconds.

Dim the Lights: After the “hunt” is over, leave the aquarium lights off for an hour or two. This helps the remaining fish (and the one you caught) calm down and return to their normal behavior.

Common Mistakes to Avoid

Even experienced hobbyists can make mistakes when trying to figure out how to catch fish in a planted aquarium. Avoid these pitfalls:

• Moving too fast: Speed creates water pressure waves that fish feel through their lateral lines. Slow and steady wins the race.
• Using the wrong net size: A net that is too small will allow the fish to jump out, while one that is too large will get snagged on plants.
• Feeding before catching: A hungry fish is much more likely to enter a trap or follow a “herding” net if there is food involved.
• Giving up too soon: If the fish is too stressed, stop. Take a break, let the tank settle, and try again in an hour or the next day.

FAQ: Frequently Asked Questions

Is it safe to catch fish with my hands?

Generally, no. The oils and soaps on human skin can be harmful to a fish’s protective slime coat. Additionally, many fish have sharp spines (like Corydoras) that can puncture your skin or get stuck. Always use a net or a container.

How long should I wait before trying again if I fail?

If you have been trying for more than 10 minutes and the fish is breathing heavily or darting frantically, stop. Give the fish at least 2 to 4 hours to calm down. Stress can weaken their immune systems.

Can I use a clear plastic bag instead of a net?

Yes! In fact, some pros prefer using a large, clear shipping bag. Fish often cannot see the clear plastic as well as they see a mesh net, making them less likely to flee.

What is the best bait for a fish trap?

Frozen foods like brine shrimp or bloodworms are usually irresistible. For herbivores or algae eaters, a fresh slice of blanched zucchini or a high-quality algae wafer works wonders.

Will lowering the water hurt my plants?

Most aquatic plants can handle being out of water for 15-20 minutes, as long as they stay damp. If you are worried, use a spray bottle to mist the leaves while the water level is low.

Conclusion

Learning how to catch fish in a planted aquarium is a skill that requires more patience than speed. By using the two-net method, lowering your water levels, or utilizing a simple DIY trap, you can protect your beautiful aquascape while ensuring your fish are handled with the utmost care.

Remember, the goal is to work with the fish’s natural instincts rather than against them. Stay calm, keep your movements fluid, and don’t be afraid to take a break if things get too chaotic.

With these professional tips from Aquifarm, you are now ready to tackle even the most challenging “catch” in your planted tank. Happy fish keeping, and may your nets always be full (and your plants always rooted)!