One of the first questions I get asked before any job is, “How much does a fish tank setup actually cost?” The honest answer is: it depends — but not in the vague way that sounds. A handful of decisions early on drive almost all of the cost, and knowing them upfront means no surprises later.
Here’s a quick view of what actually moves the price:
| Cost driver | Impact on price | Why |
|---|---|---|
| Tank size (volume) | Highest | Bigger tank, stand, substrate, and filtration all scale with litres |
| Filtration & equipment | High | Correctly-rated filters, heaters and lighting cost more but save money long term |
| Substrate & decor | Medium | Most controllable — a simple setup can look as good as an elaborate one |
| Livestock (fish) | Medium | Varies hugely by species; budget last, once the tank has cycled |
| Professional vs DIY setup | Medium | The real difference is getting it right the first time, not the gear |
Tank Size Is the Biggest Factor
Cost scales with volume. A small 60-litre starter tank is cheap to fill and equip. A large 400-litre statement piece needs a bigger tank, a stronger stand, more substrate, more water conditioner, and filtration rated for that volume. Bigger tanks cost more upfront, but they’re also more forgiving once running — more water means more stable chemistry.
Filtration and Equipment
Filtration is where quality actually matters, and it’s not a place to cut corners. A filter rated correctly for your tank size costs more than an undersized one, but an undersized filter means algae, cloudy water, and stressed fish — problems that cost more to fix later. (If you’re unsure which filter suits your tank, see our guide on choosing the right aquarium filter.) Heaters, lighting, and an air pump (if you’re running one) add to the setup cost too, and the right gear for your fish is worth paying for once rather than replacing twice.
Substrate, Decor, and Livestock
Gravel or sand, hardscape like rock and driftwood, and plants all add up — but this is also where you have the most control. A simple, well-chosen setup can look just as good as an elaborate one for a fraction of the cost. Fish themselves vary hugely in price depending on species, and it’s worth budgeting for them last, once the tank has cycled and is actually ready.
Professional Setup vs DIY
A lot of the cost difference between a DIY setup and a professional one isn’t the gear — it’s getting it right the first time. I’ve been called out to fix tanks where the wrong filter was bought, the substrate was wrong for the fish, or the tank wasn’t cycled properly before fish went in. Redoing a setup costs more than doing it properly from the start. A professional setup also factors in the ongoing side: positioning, plumbing, and maintenance access, so the tank stays easy to look after long term.
What It Comes Down To
There’s no single number that applies to every tank, because every setup is different. But the tanks that end up costing the most are the ones set up twice — once wrong, then again properly. Getting the size, filtration, and setup right from day one is the cheapest path to a tank that just works.
If you’re in Melbourne and want a clear, upfront quote for your fish tank setup, Aquatics by Ash can walk you through exactly what your tank needs — no guesswork, no overselling.