How much does it really cost to set up a fish tank?

What do you actually need?

Before the numbers, let’s be clear about what the non-negotiables are. You can cut costs in some areas. You cannot skip these:

• Tank — the glass or acrylic container
• Filter — biological and mechanical filtration is not optional. It keeps your fish alive.
• Heater — for tropical freshwater fish. Coldwater fish (goldfish, white cloud minnows) don’t need one in temperate homes.
• Thermometer — you need to know your actual temperature.
• Dechlorinator — tap water contains chlorine/chloramine which kills beneficial bacteria and stresses fish.
• Water test kit — during cycling and ongoing. A liquid test kit (API Master Test Kit or equivalent) is far more accurate than strips.
• Substrate — gravel, sand, or soil. Fish need a bottom layer.
• Light — many tank kits include this. If you want plants, you need adequate spectrum and intensity.

Things you might want but can delay or skip:

• CO₂ system (only needed for demanding planted tanks)
• Air pump and airstone (often not needed if filter provides surface agitation)
• Gravel vacuum (essential for maintenance but not day one)
• Net, scraper, bucket (cheap and necessary from day one)
• Decorations beyond what you actually like

Setup cost by tank size — three tiers

Costs are categorised into three tiers: Budget (minimum viable, no-frills), Mid-range (good quality without overspending), and Premium (quality gear you won’t need to replace). All prices are approximate ranges reflecting typical retail in 2025–2026.

Small tank: 40–60 litres (10–15 gallons)

Ideal for a betta, small community of nano fish, or a shrimp tank. The most accessible entry point — but don’t go smaller than 40 litres if you want tropical fish. Smaller tanks are harder to maintain, not easier.

Item	Budget	Mid-range	Premium
Tank + hood/lid	£30–50	£60–90	£120–200
Filter	£15–25	£25–45	£45–80
Heater	£12–18	£18–30	£30–50
Substrate (5 kg)	£8–12	£12–20	£20–40
Test kit, dechlorinator, thermometer	£20–28	£25–35	£30–45
Basic decor / plants	£10–20	£20–50	£50–120
Fish (small stocking)	£15–30	£30–60	£40–100
Total (40–60 L)	£110–183	£190–330	£335–635

Medium tank: 100–150 litres (25–40 gallons)

The sweet spot for most beginners. Large enough to be stable, small enough to be manageable. A well-stocked 120-litre community tank is genuinely achievable and rewarding. See our 100-litre tank setup guide for stocking ideas.

Item	Budget	Mid-range	Premium
Tank + hood/lid	£60–90	£100–160	£200–400
Filter	£25–40	£45–80	£80–160
Heater	£18–25	£30–50	£50–90
Substrate (10–15 kg)	£15–25	£25–45	£45–90
Test kit, dechlorinator, thermometer	£22–30	£28–40	£35–55
Decor, plants, hardscape	£20–40	£50–100	£100–300
Fish	£30–60	£60–120	£80–200
Total (100–150 L)	£190–310	£338–595	£590–1,295

Large tank: 200–300 litres (55–80 gallons)

For serious community setups, larger cichlids, or a planted display tank. Larger tanks are more stable and actually easier to maintain once established — but the upfront cost and ongoing electricity are significant.

Item	Budget	Mid-range	Premium
Tank + cabinet/stand	£150–250	£300–550	£600–1,500
Filter (canister recommended)	£60–90	£90–150	£150–300
Heater (x2 recommended)	£35–50	£60–90	£100–180
Substrate (20–30 kg)	£30–50	£50–90	£90–200
Test kit, consumables	£25–35	£35–55	£40–70
Lighting (plants need quality light)	£30–60	£70–150	£150–400
Hardscape, plants, decor	£40–80	£100–250	£250–700
Fish	£50–100	£100–250	£150–500
Total (200–300 L)	£420–715	£805–1,585	£1,530–3,850

Regional price comparison

Aquarium equipment pricing varies significantly by market. UK prices tend to be mid-to-high relative to global averages; the USA has strong online retail competition keeping prices lower; Australia and New Zealand pay a significant premium due to import costs and market size; Canada sits broadly in line with the USA; Europe varies by country but is broadly similar to UK for branded gear.

The table below shows approximate equivalent costs for a mid-range 100-litre (25-gallon) complete setup (all hardware, no fish):

Region	Budget setup	Mid-range	Premium
🇬🇧 United Kingdom	£130–200	£280–480	£500–1,100
🇺🇸 United States	$130–200	$270–460	$490–1,050
🇪🇺 Europe (€)	€140–210	€290–490	€530–1,150
🇨🇦 Canada	CA$175–270	CA$365–625	CA$660–1,400
🇦🇺 Australia	A$220–340	A$460–790	A$840–1,800
🇳🇿 New Zealand	NZ$250–390	NZ$520–890	NZ$950–2,000

Prices are typical retail 2025–2026 estimates. Online retailers, second-hand markets (Facebook Marketplace, Gumtree, Craigslist) and tank kit bundles can significantly reduce costs. Fish prices are excluded from this table and vary widely by species and availability.

Ongoing monthly costs

Setup cost is one-off. Running costs are forever. Don’t ignore them:

• Electricity. A 100-litre heated tropical tank typically runs a 100W heater (cycling, not constant) and a 20–40W filter. In the UK, that’s roughly £8–15 per month. A 300-litre tank with a canister filter and quality lighting can run £25–45 per month. In the USA, similar setups run $8–20/month. Australia and NZ pay significantly higher per-kWh rates — expect 50–80% more than UK equivalent.
• Food. £2–8 per month depending on fish count and food quality.
• Water conditioner. £1–3 per month.
• Filter media replacement. £5–15 every 2–3 months (sponge, carbon, ceramic).
• Medications. Occasional and unpredictable — budget £10–20 per year for a small tank.
• Plants. Ongoing additions, especially in the first year as you figure out what grows in your conditions.

Rough monthly running cost for a 100-litre tropical community tank: £15–30 in the UK, $15–30 in the USA, A$25–50 in Australia.

Where to save money (without compromising fish welfare)

• Buy second-hand hardware. Facebook Marketplace and Gumtree (UK), Craigslist and OfferUp (USA), Gumtree (AU) regularly list complete aquarium setups for a fraction of retail. Inspect for leaks (fill with water outside), and clean everything thoroughly before use. The tank and cabinet are the biggest savings here.
• Don’t buy the cheapest heater. A failed heater either cooks your fish or leaves them cold. Spending £15 more on a reputable brand (Aquael, Eheim, Fluval) is genuine protection for your fish.
• Buy fish last. Let the tank cycle first. Fish added to an uncycled tank often die, costing money and causing unnecessary suffering. Our cycling guide explains the process.
• Grow plants from cuttings. Ask in local fishkeeping Facebook groups and forums — most hobbyists regularly trim plants and give cuttings away for free or cheap.
• Start with hardy fish. Beginner-friendly fish like zebra danios, platies, corydoras, and cherry barbs forgive mistakes that would kill more sensitive species. You’ll spend less replacing fish while learning.

The hidden cost nobody mentions: time

A well-run aquarium requires roughly 1–2 hours per week of active maintenance — water changes, gravel vacuuming, glass cleaning, feeding, parameter testing. More for larger or more complex setups. This isn’t a complaint — for most hobbyists it’s exactly the point. But it’s a real commitment that should be part of your honest cost-benefit calculation.

Tracking maintenance in an app reduces the mental load significantly. App-aquatic sends care reminders, tracks parameter logs, and tells you at a glance when each task is due — so the weekly maintenance becomes a routine rather than a worry. It’s also free to try.