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What does a 20-gallon long freshwater tank cost to set up?
About $658 for a Mid-range setup, before tax and shipping. A Budget list comes to $649 and Premium to $803. Running the Mid-range list then costs about $9.55 a month. Prices are store listings we checked by hand on Oct 19, 2026.
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Open this list in the planner Monthly running cost
In the planner you can edit any price, switch tiers, drop recommended items, add your tax and shipping, and compare listings store by store.
Mid-range parts list
The estimated budget is the median of the store listings we checked by hand, rounded to the dollar. Listings are actual store prices on the date shown. Amazon doesn't allow us to show its prices, so the planner links to an Amazon search for each item instead.
| Item | Our pick | Estimated budget | Store prices checked |
|---|---|---|---|
| Tank and stand | |||
| Tank Standard 20-gallon long glass tank, 30 × 12 × 12 in | Aqueon 20 Gallon Long glass aquarium (30 × 12 × 12 in) | $68 (only one store showed stock, so this uses every listing) |
Checked Oct 19, 2026 |
| Stand Made for a 30 × 12 in tank and its filled weight (about 225 lb) | Marineland Newport cabinet stand, 30 × 12 in | $196 |
Checked Oct 19, 2026 |
| Lid (recommended) Glass top that fits the 30 × 12 in rim (stops jumpers, slows evaporation) | Aqueon Hinged glass top, 30 × 12 in | $30 |
Checked Oct 19, 2026 |
| Filtration and flow | |||
| Filter Rated for 20+ gal, about 80–120 gph (4–6× turnover) | Seachem Tidal 35 hang-on filter (up to 35 gal) | $55 |
Checked Oct 19, 2026 |
| Heating | |||
| Heater Adjustable, about 100 W | Eheim Jäger 100 W adjustable heater | $33 |
Checked Oct 19, 2026 |
| Lighting | |||
| Light LED sized for a 30 in tank | Hygger HG978 Advanced Spectrum LED, 30–36 in, 26 W | $53 |
Checked Oct 19, 2026 |
| Substrate and rock | |||
| Substrate (recommended) About 42 lb for a 2 in bed | CaribSea Super Naturals sand or gravel, 20 lb bag × 3 | $96 ($32 each) |
Checked Oct 19, 2026 |
| Water | |||
| Water conditioner Removes chlorine and chloramine from tap water | Seachem Prime water conditioner, 250 mL | $12 |
Checked Oct 19, 2026 |
| Bottled bacteria (recommended) Bottled nitrifying bacteria to start the cycle | Seachem Stability bacteria starter, 250 mL | $11 |
Checked Oct 19, 2026 |
| Testing | |||
| Test kit Liquid tests for ammonia, nitrite, nitrate and pH (needed to cycle) | API Freshwater Master Test Kit (liquid) | $38 |
Checked Oct 19, 2026 |
| Maintenance | |||
| Siphon / water changer Siphon for water changes and cleaning the bottom | Python Pro-Clean gravel washer and siphon, medium | $13 |
Checked Oct 19, 2026 |
| Bucket Aquarium-only bucket | UNS Aquarium maintenance bucket, 5 gal | $16 |
Checked Oct 19, 2026 |
| Net Soft fish net | Seachem Fish net, 6 in | $4 |
Checked Oct 19, 2026 |
| Glass cleaner (recommended) Magnet glass cleaner for 20-gal glass | Gulf Stream Mag-Float glass cleaner, small (up to 30 gal) | $26 |
Checked Oct 19, 2026 |
| Thermometer Separate thermometer to catch a failed heater | Aquatop Smart Temp digital thermometer (magnet mount) | $7 |
Checked Oct 19, 2026 |
| Total, Mid-range (15 items, before tax and shipping) | $658 | ||
How Budget and Premium differ
Only the items that change are shown. Everything else is the same in all three tiers.
| Item | Budget | Mid-range | Premium |
|---|---|---|---|
| Filter | Fluval AquaClear 30 hang-on filter (10–30 gal) $46 | Seachem Tidal 35 hang-on filter (up to 35 gal) $55 | Seachem Tidal 35 hang-on filter (up to 35 gal) $55 |
| Heater | Eheim Jäger 100 W adjustable heater $33 | Eheim Jäger 100 W adjustable heater $33 | Fluval E 100 W electronic heater with display $72 |
| Light | Hygger HG978 Advanced Spectrum LED, 30–36 in, 26 W $53 | Hygger HG978 Advanced Spectrum LED, 30–36 in, 26 W $53 | Fluval Aquasky 3.0 Bluetooth LED, 24–36 in, 18 W $116 |
| Siphon / water changer | Python Pro-Clean gravel washer and siphon, medium $13 | Python Pro-Clean gravel washer and siphon, medium $13 | Python No Spill Clean and Fill, 25 ft $56 |
| Setup total | $649 | $658 | $803 |
| Monthly to run | $9.67 | $9.55 | $9.22 |
Open Budget in the plannerOpen Mid-range in the plannerOpen Premium in the planner
Why some tiers reuse the Mid-range pick
- Premium, filter: Same as Mid-range: a bigger or canister filter doesn't add anything meaningful on this tank.
- Premium, stand: Same as Mid-range: pricier stands are about looks, not function.
- Premium, tank: Same as Mid-range.
- Premium, substrate: Same as Mid-range.
Budget is the cheapest reliable option that meets the requirement. Mid-range is the best balance. Premium has to add a real gain, or it reuses the Mid-range pick.
What the Mid-range list costs to run
About $9.55 a month, so the first year comes to about $773 including setup. That's 132 W of rated equipment (32.6 kWh a month) at 17¢ per kWh, with the light on 8 hours a day and the heater on 30% of the time, plus supplies. Food isn't included.
| Electricity | $5.55 |
| Testing | $1.08 |
| Water conditioner | $0.03 |
| Filter carbon | $2.89 |
| Total per month | $9.55 |
The 20-gallon long running-cost page works through the same tank line by line with a typical calculator setup, so its figure differs slightly from this exact list.
Is a starter kit cheaper?
Boxed “20-gallon” starter kits from Aqueon and Marineland are 20 High (24 × 12 × 16 in), not 20 Long, so there's no like-for-like kit to compare.
Good to know
- Heavy items: the tank, stand and substrate are expensive to ship. Local pickup often saves money. Filled, a standard 20-gallon tank weighs about 225 lb, so the stand has to be made for it.
- Not included: fish, coral, plants and cleanup crew; food, décor and light mounts; shipping and sales tax; electrical work, a GFCI outlet or a surge strip.
- Before you add fish: cycle the tank first, which usually takes several weeks. Test ammonia and nitrite until both read zero and nitrate starts to rise, then add livestock slowly.
FAQ
How much does it cost to set up a 20-gallon long freshwater tank?
About $658 for Mid-range equipment and supplies, before tax, shipping and livestock. Our Budget list comes to $649 and Premium to $803. Prices are store listings checked Oct 19, 2026.
What are the biggest costs in a 20-gallon long freshwater setup?
In the Mid-range list: stand ($196), substrate ($96), tank ($68). Together they're 55% of the total.
How much does a 20-gallon long freshwater tank cost per month to run?
About $9.55 a month for the Mid-range list at 17¢ per kWh, before food, or $773 for the first year including setup.
Is a starter kit cheaper for a 20-gallon long freshwater tank?
Boxed “20-gallon” starter kits from Aqueon and Marineland are 20 High (24 × 12 × 16 in), not 20 Long, so there's no like-for-like kit to compare.
Other setups
- 55-gallon freshwater: about $1,008
- 55-gallon reef: about $2,869
- 75-gallon freshwater: about $1,157
- 75-gallon reef: about $3,264
Compare every setup side by side → · What a 20-gallon long tank costs per month →
How we size each item, and where prices come from
- Aqueon critical dimensions and filled weights (2023 PDF)
- Complete Aquatics: filter turnover of 4–6× tank volume per hour
- Fluval heater sizing (the rule our running-cost calculator uses)
- Top Shelf Aquatics sand-bed calculator (L × W × depth ÷ 1,728 × ~100 lb/ft³)
- Listings: hand-picked items checked at 11 stores (AquaticMotiv, Blue Fish Aquarium, Buce Plant, Bulk Reef Supply, Glass Aqua, Ken's Fish, PetSmart, Pets Warehouse, Premium Aquatics, Rockland Aquarium, Tropical Showcase) on Oct 19, 2026. Each item needs 2+ non-Amazon stores; a listing older than 45 days is dropped. The estimated budget is the median listing, rounded.
- How we choose: performance, reliability, value and fit for the tank, without regard to brand or commission. Credible reports of serious problems can rule an item out.