Budget setup: $500-800 for a 30-gallon nano (tank, light, skimmer, sump, heater, salt mix, RO/DI). Mid-range: $1,500-2,500 for a 65-90 gallon mixed reef. Enthusiast: $3,500-7,000+. Ongoing costs: $50-150/month for salt mix, supplements, electricity.
Saltwater costs decompose into three buckets: tank + equipment (one-time), livestock (one-time but cumulative), and operating costs (monthly).
| Item | 30-gal nano | 65-90 gal | 120+ gal |
|---|---|---|---|
| Tank + stand | $200-350 | $500-1,000 | $1,200-2,500 |
| Reef-spec LED | $150-300 | $400-800 | $1,000-2,000 |
| Protein skimmer | $100-200 | $200-400 | $400-800 |
| Sump + return pump | $150-250 | $300-500 | $500-900 |
| Powerheads | $50-100 | $150-300 | $300-600 |
| Heater + controller | $30-60 | $60-120 | $100-200 |
| RO/DI unit | $80-150 | $150-250 | $200-400 |
| Live rock + sand | $80-150 | $200-400 | $400-800 |
| Total equipment | $840-1,560 | $1,960-3,770 | $4,100-8,200 |
Yes for nano-size tanks (under 30 gallons). Hang-on-back skimmers (Aquatic Life HOB, AquaMaxx HOB-1) work for nanos. Tanks 40+ gallons benefit dramatically from a sump - it adds water volume, hides equipment, and provides a refugium for nutrient export.
No. Reef tanks cost 3-5x more in both equipment and livestock than equivalent-size planted freshwater tanks. The justification is the visual and biological complexity reef tanks support.
Whatever specific topic brought you here, four fundamentals govern long-term aquarium success: water quality, parameter stability, biological filtration, and species-appropriate husbandry. Skip any one and the others struggle to compensate.
Water quality: ammonia + nitrite at zero, nitrate under 30 ppm freshwater + 10 ppm reef. Test weekly with API or Salifert kits. Use our water parameter checker to score your readings against your tank type.
Parameter stability: stable wrong parameters beat fluctuating ideal parameters. Most fish tolerate a wide pH range if it's stable. Sudden swings of 0.4+ pH or 5+°F kill fish faster than chronic suboptimal values. Use temperature controllers (Inkbird) + automated dosing for consistency.
Biological filtration: the bacterial colony on your filter media + rock + substrate is the engine. Never replace all media at once. Use our filter turnover calculator to size correctly.
Species-appropriate husbandry: research adult size, territoriality, diet, and tankmate compatibility before purchase. Use our tank stocking calculator + compatibility guides.
How long does an aquarium take to set up? 4-6 weeks for full cycling + first stocking. Use our cycle ETA calculator + how long does cycling take.
What's the best aquarium for beginners? 20-gallon long. Big enough for parameter stability, small enough for budget + space. See beginner picks.
How often should I do water changes? 25-30% weekly. See water change frequency Q&A + water change calculator.
Why does my fish keep dying? 5 leading causes: uncycled tank, wrong species pairings, no quarantine, undersized tank, neglected water-change schedule. See full diagnosis.
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