Aquarium Essentials: A Complete Guide for Healthy Fish
Learn how to set up the perfect aquarium and keep your fish thriving.
Most new aquariums fail for one reason: the tank was stocked before it was ready. Get the setup order right and fishkeeping becomes genuinely low-maintenance.
Pick a bigger tank than you think you need
Small tanks are harder, not easier. Water parameters swing quickly in a few litres and slowly in many. A 60-litre tank is far more forgiving for a beginner than a 20-litre desktop cube.
Cycle the tank before you add fish
This is the step people skip. A new tank has no bacteria to convert fish waste, so ammonia builds up and burns gills. Run the filter for four to six weeks with a small ammonia source, testing until ammonia and nitrite both read zero and nitrate is climbing. Only then add fish.
The equipment that actually matters
- Filter — rated for at least your tank volume. It houses the bacteria doing the real work.
- Heater — tropical species need a stable 24-26°C. Cold-water species don't need one.
- Test kit — liquid kits are far more accurate than strips.
- Dechlorinator — tap water chlorine kills your filter bacteria.
Substrate, plants and hiding places
Fine gravel or sand suits most community fish. Live plants consume nitrate and give shy species cover — hardy ones like java fern, anubias and vallisneria need no special lighting or CO2.
Feeding and water changes
Feed only what's eaten in two minutes, once a day. Overfeeding is the single most common cause of cloudy water. Change 20-25% of the water weekly, matching temperature and dosing dechlorinator before it goes in.
Stock slowly
Add a few fish at a time and wait two weeks between additions so the filter can keep up. Research the adult size of every species before you buy — plenty of "small" shop fish reach 15cm.
