Fishkeeping can be one of the most rewarding hobbies, but like any passion, it’s surrounded by old advice that just doesn’t hold up under scrutiny. Whether you’re just starting out or have been keeping tanks for years, myths can overcomplicate what should be joyful care for your aquatic world.
In this blog, we’re diving deep into some of the most common fishkeeping myths – including that familiar old tale about fish only growing to the size of their tank – to give you the clear, evidence-based truth behind successful, happy aquariums.
Myth #1: Fish Only Grow to the Size of Their Tank
One of the most persistent fishkeeping myths is the idea that your fish will only grow as big as the space they’re given. In reality, fish grow based on their genetics and overall care, not because the tank magically limits them.
When fish are kept in tanks that are too small:
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- Their growth can become stunted,
- Their immune system weakens,
- And they may experience health issues and shortened lifespans.
That’s why choosing a tank size that fits your species’ adult potential, not just the tiny juvenile you bring home – is one of the best gifts you can give your aquatic friends.
Myth #2: You Don’t Really Need a Filter
Some people believe that fish can live in their water without a filter if it’s “clean enough” or if the tank has plants. But the truth is, filtration is one of the most important elements of a healthy aquarium.
Here’s why filters matter:
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- They help manage fish waste, converting harmful ammonia into less toxic substances.
- They support beneficial bacteria colonies – essential for a stable nitrogen cycle.
- They promote water clarity and gas exchange, keeping oxygen levels healthier for fish.
Even heavily planted tanks can’t replace a good filter – plants help, but they can’t handle all of the bio-load that a busy aquarium generates on their own.
Tip: Choose a filter rated for your tank size or slightly above. A filter’s job isn’t just to circulate water – it’s to create a safe, thriving environment. Filters from the AquaRays range make this simple and reliable.
Myth #3: Smaller Tanks Are Easier for Beginners
It might seem like less water means less to manage, but smaller tanks are actually more sensitive to changes in water quality, temperature, and waste buildup.
Because of the smaller volume:
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- pH and ammonia can spike quickly,
- Temperature fluctuations happen easily,
- And even a single mistake can stress your fish faster.
For beginners, starting with a moderate-sized aquarium gives you more stability and time to learn the rhythm of maintenance, including water testing and filter care.
Myth #4: Filters Remove the Need for Water Changes
While filters are ecosystem helpers, they don’t replace the benefits of regular water changes. Filters keep water biologically balanced and clear, but they can’t remove dissolved waste products like nitrates on their own.
Regular water changes:
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- Reduce nitrate buildup,
- Improve water quality,
- And help your fish stay vibrant and healthy.
Pairing good filtration with a water care routine – including products like test kits – sets your tank up for long-term success.
Going Beyond the Myths
Fishkeeping isn’t about memorising rules – it’s about understanding your tank’s needs and responding with care. When you base your setup on facts, supported by products that help maintain balance, your fish have the best chance to flourish.
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