Freshwater or saltwater: where should you start in fishkeeping?
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Start with freshwater: an entry-level reef tank costs 800 to 1 500 € while a beautiful freshwater aquarium starts at 200 €, and saltwater forgives almost no parameter mistakes. Freshwater delivers 90 % of the pleasure for 20 % of the budget and constraints — saltwater has to be earned, usually after a year or two of practice.
Contents · 5 sections
Why is saltwater so expensive?
Everything adds up: a dedicated tank with a sump (300 to 600 €), a protein skimmer (100 to 250 €), powerful lighting for corals (150 to 400 €), circulation pumps, synthetic salt (30 to 40 € per bucket lasting two months), a hydrometer and specific test kits. The fish themselves change scale: 15 to 60 € apiece versus 2 to 10 € in freshwater. Add mandatory reverse-osmosis water and a doubled electricity bill.
Is freshwater really easier?
- Tolerant parameters: most species accept conditioned tap water.
- Recoverable mistakes: a missed maintenance session can be fixed, whereas a reef tank crashes within 48 hours.
- Light maintenance: 20 minutes a week versus an hour or more in saltwater.
- Simple equipment: filter, heater, lighting — see our 10 first-aquarium mistakes to start on the right foot.
What should you choose if reef tanks are your dream?
Cut your teeth for a year on a planted freshwater tank of 100 to 120 litres: you’ll learn the nitrogen cycle, the discipline of testing and patience, three directly transferable skills. You’ll also find out whether the weekly commitment suits you before investing a serious budget, detailed in our guide to the monthly cost of an aquarium.
What budget for each option in the first year?
Freshwater 100 litres: 250 to 400 € for setup, 15 to 25 € per month. Saltwater 200-litre reef: 1 200 to 2 500 € for setup, 50 to 90 € per month. The gap easily funds a gradual upgrade on the freshwater tanks and habitats side.
Frequently asked questions
Is there an easy saltwater option for beginners?
A fish-only tank (no corals) brings the bill down to 500-800 € and tolerates slightly more approximation, but it remains more demanding than any freshwater tank.
Will freshwater equipment be reusable in saltwater?
Partially: the tank, the heater and some pumps yes; the lighting and filtration will almost always need replacing.
Are freshwater fish less beautiful?
No: killifish, apistogrammas, bettas and Endler’s guppies rival each other in colour, for a few euros apiece.
In our shop, for this use: Hollow moss-effect resin log for aquariums (€20.90) · the whole shop
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.