Planted Tank vs Fish-Only Aquarium: Pros and Cons

Table of Contents

• Overview: Two Approaches to the Same Hobby
• Side-by-Side Comparison Table
• Cost Breakdown
• Maintenance Time and Effort
• Equipment Differences
• Fish Health and Behaviour
• Aesthetics and Design
• The Middle Ground: Easy Plants Only
• Frequently Asked Questions

One of the first decisions every new fishkeeper faces is whether to include live plants. It sounds simple, but the choice ripples through every subsequent decision — equipment, budget, maintenance routine, fish selection and even the tank’s long-term success. Both approaches have genuine strengths, and the right answer depends on your goals, budget and how much time you want to spend on upkeep.

At Gensou, we have been building both planted and fish-only setups at our 5 Everton Park shop for over twenty years. This guide lays out the honest pros and cons of each approach so you can make an informed decision.

Overview: Two Approaches to the Same Hobby

A fish-only aquarium uses artificial or no decorations beyond hardscape (rocks, driftwood) and focuses entirely on the fish. Filtration is mechanical and biological, handled entirely by the filter. Many successful, beautiful tanks follow this approach.

A planted tank incorporates live aquatic plants as a core element. The plants contribute to filtration by absorbing ammonia, nitrite and nitrate directly. They also produce oxygen, provide hiding spots and create a more naturalistic environment. The trade-off is additional equipment, knowledge and maintenance.

Side-by-Side Comparison Table

Cost Breakdown

The upfront cost difference is real. A fish-only setup needs a tank, filter, basic light and decorations. A planted tank adds nutrient-rich substrate ($30–$80), a stronger light ($50–$200), liquid fertilisers ($15–$30) and plants themselves ($30–$100+ depending on species and quantity).

High-tech planted tanks add CO2 injection, which involves a CO2 cylinder, regulator, solenoid valve and diffuser. A basic pressurised CO2 setup in Singapore runs $150 to $300. This is entirely optional — many stunning planted tanks run without CO2.

The ongoing cost difference is smaller. Fertilisers cost perhaps $10 to $20 per month. CO2 refills (if used) cost $15 to $30 every few months depending on tank size. Fish-only tanks may spend more on artificial decorations, which can be surprisingly expensive.

Maintenance Time and Effort

Fish-only maintenance

Weekly water changes (20–30 per cent), gravel vacuuming, glass cleaning, filter rinse monthly. Straightforward and predictable. Most hobbyists spend 30 to 45 minutes per week.

Planted tank maintenance

Everything above, plus trimming overgrown plants, replanting stems that have grown too tall, removing dead leaves, dosing fertilisers (daily or weekly depending on your system) and monitoring plant health. High-tech setups also require checking CO2 levels, cleaning diffusers and adjusting the photoperiod seasonally. Expect 45 to 90 minutes per week, sometimes more after a major trim.

Some aquarists find plant maintenance therapeutic. Others find it tedious. Be honest with yourself about which camp you fall into before committing to a heavily planted layout.

Equipment Differences

Lighting

Fish-only tanks need light primarily for viewing. Any LED that makes the fish look good will do. Planted tanks need light that supports photosynthesis — measured in PAR (photosynthetically active radiation) rather than just lumens. Budget LEDs included with starter kits are often insufficient for demanding plant species. Refer to our guide on low-tech vs high-tech planted tanks for specific lighting recommendations.

Substrate

Fish-only setups can use any inert substrate — gravel, sand, bare bottom. Planted tanks benefit enormously from nutrient-rich aquasoil, which provides iron, potassium and other nutrients directly to plant roots. Inert substrates can work with root tabs, but aquasoil makes plant growth significantly easier.

Filtration

Both setups need good filtration, but planted tanks are more forgiving because the plants themselves act as a supplementary biological filter. In a well-planted tank, ammonia and nitrate levels are often lower than in a fish-only tank with the same bioload. Some planted-tank enthusiasts run minimal filtration for this reason.

Fish Health and Behaviour

This is where planted tanks have an undeniable advantage. Live plants benefit fish in multiple ways:

• Natural filtration — plants absorb ammonia, nitrite and nitrate directly from the water column. This creates a buffer against water-quality issues, especially in smaller tanks.
• Oxygen production — during the photoperiod, plants release oxygen, raising dissolved oxygen levels. Fish breathe easier.
• Stress reduction — plants provide hiding spots, territory boundaries and visual barriers. Shy fish (many tetras, rasboras, shrimp) are measurably less stressed and display more natural behaviour in planted environments.
• Breeding success — many species require plants for spawning. Fine-leaved plants like Java moss serve as egg-laying sites and shelter for fry.
• Enrichment — fish interact with plants, foraging among leaves and exploring the structure. A planted tank offers a more complex, stimulating environment than artificial decorations.

Studies have shown that fish in planted environments exhibit brighter colouration, more natural social behaviour and lower cortisol (stress hormone) levels compared to fish in barren tanks.

Aesthetics and Design

Aesthetics are subjective, but the two approaches produce distinctly different results. Fish-only tanks tend toward a clean, minimalist look — bold hardscape, open swimming space, the fish as the centrepiece. This style can be striking, particularly with colourful cichlids or large show fish.

Planted tanks create a living, evolving landscape. They change with the seasons (or at least with each trimming session). The interplay of light, shadow, texture and colour from different plant species adds a dimension that artificial decorations cannot replicate. Aquascaping competitions worldwide are overwhelmingly dominated by planted layouts for a reason.

Both can be beautiful. But if you want a tank that looks like a slice of nature, plants are the way to achieve it.

The Middle Ground: Easy Plants Only

You do not have to choose between a barren fish-only tank and a demanding high-tech planted setup. The middle ground — a few hardy, low-maintenance plants — gives you most of the benefits with minimal extra effort.

Easy plants that thrive in Singapore’s warm water without CO2 injection:

• Java fern — attach to driftwood or rocks, virtually indestructible.
• Anubias — slow-growing, tolerates low light, attach to hardscape.
• Java moss — drape over driftwood for a natural, aged look.
• Bucephalandra — beautiful, slow-growing, attaches to rocks.
• Floating plants — Salvinia, Frogbit or Water lettuce. No planting needed; they float on the surface and absorb nitrate aggressively.
• Cryptocoryne species — plant in substrate, tolerant of low light and warm temperatures.

These plants need no CO2, minimal fertilisation (a weekly dose of liquid fertiliser is sufficient) and tolerate the basic lights included with most starter kits. They grow slowly, so trimming is infrequent. This approach is ideal for beginners who want the benefits of live plants without the learning curve of a high-tech setup.

Frequently Asked Questions

Which is better for beginners: planted or fish-only?

A low-tech planted tank with easy plants is the best starting point. You get the water-quality benefits of live plants without the complexity of CO2 and high-intensity lighting. If the idea of keeping plants alive stresses you out, start fish-only and add plants later once you are comfortable with basic fishkeeping.

Do planted tanks have more algae problems?

Counterintuitively, well-balanced planted tanks often have less algae than fish-only tanks. Healthy plants outcompete algae for nutrients and light. Problems arise when the balance tips — too much light, not enough CO2 or fertiliser, or dying plants. Low-tech setups with moderate lighting have the fewest algae issues overall.

Can I convert a fish-only tank to planted later?

Yes. You can add epiphyte plants (Java fern, Anubias, Bucephalandra) to any existing tank without changing the substrate — just attach them to rocks or driftwood. Adding rooted plants requires nutrient-rich substrate or root tabs pushed into the existing gravel or sand. Converting to high-tech planted requires adding a stronger light and CO2 system.

Which fish do not suit planted tanks?

Large cichlids dig up plants. Silver dollars, Buenos Aires tetras and some barbs eat soft-leaved plants. Goldfish uproot and nibble plants constantly. If you keep these species, stick to tough plants like Anubias and Java fern, or accept some plant damage as part of the setup.

Not Sure Which Route to Take?

The decision is easier when you can see both approaches side by side. Visit our showroom at 5 Everton Park — we maintain both planted and fish-only display tanks and can walk you through the practical differences in person. Whether you want a lush aquascape or a clean, fish-focused setup, we have been helping Singaporeans design their ideal aquariums for over twenty years.

Contact us to discuss your setup, or drop by the shop any time.

Related Reading

• Aquarium as Home Décor: Placement, Styles and Design Tips
• Aquarium Background Ideas: Paint, Film, 3D and Natural
• 10 Beginner Aquarium Mistakes and How to Avoid Them
• Top Aquarium Mistakes in the First Month and How to Avoid Them
• Monthly Aquarium Cleaning Schedule: What to Do and When