Berapa Ekor Ikan dalam Akuarium? Stocking Guide by Tank Size
Berapa ekor ikan dalam akuarium is safe? It depends less on litres and more on how big your fish grow, how much waste they produce, and how strong your filter is. As a starting point, a standard 2 kaki tank comfortably holds about 10–15 small fish (tetras, rasboras, guppies) plus a few bottom-dwellers, or just 2 fancy goldfish, or 1 betta with a small group of peaceful nano fish. Use the tables below by tank size, then adjust for your filter, plants and how often you change water.
Why the "1 Inch Per Gallon" Rule Fails
You may have heard "one inch of fish per gallon of water". It's a poor guide because:
- Body mass grows much faster than length. A 10 cm goldfish produces many times the waste of a 2.5 cm tetra, not four times.
- It ignores adult size. Buying a 5 cm pleco or arowana for a 2 kaki tank looks fine on day one and is a disaster within a year.
- It ignores behaviour. Territorial fish (bettas, many cichlids) need space, not just water volume.
- It ignores swimming room. Fast schooling fish need tank length.
Always plan for the adult size of every fish, not the size in the shop.
Bioload: The Real Limit
"Bioload" means the total waste your fish produce. Heavy-bioload fish include goldfish, koi, plecos, oscars and other big cichlids, and arowana. Light-bioload fish include most nano fish, rasboras, small tetras and shrimp.
Your safe stocking level depends on:
| Factor | Allows more fish | Allows fewer fish |
|---|---|---|
| Filter | Strong, well-matured filter | Small or new filter |
| Plants | Heavily planted | Bare tank, plastic plants |
| Water changes | Weekly 30% or more | Rare changes |
| Temperature | Cooler water | Hot water (28–31°C), which holds less oxygen |
| Aeration | Air pump running | No aeration |
| Feeding | Light, careful feeding | Heavy feeding |
Malaysian tanks run warm, which lowers dissolved oxygen and speeds up waste breakdown, so stock a little lighter than guides written for cooler countries, and run an air pump (pam udara).
Berapa Ekor Ikan dalam Akuarium? Stocking by Tank Size (Kaki)
Not sure of your tank's volume? See our tank size and litres guide. The examples below are separate options, not all at once.
1 kaki (nano)
| Option | Example stocking |
|---|---|
| A | 1 betta (ikan laga) on its own |
| B | 6–8 chili rasbora or other nano fish |
| C | A colony of cherry shrimp with a few snails |
Avoid: goldfish, guppy groups that will breed, any fish over 4 cm as adults.
2 kaki
| Option | Example stocking |
|---|---|
| A | 10–12 small tetras or rasboras + 6 corydoras + snails |
| B | 1 male betta + 8 small rasboras + shrimp |
| C | 6–8 guppies or platies (expect fry) + a few corydoras |
| D | 2 fancy goldfish only |
| E | 1 pair of dwarf gourami or German blue ram + a small school of tetras |
3 kaki
| Option | Example stocking |
|---|---|
| A | 20–25 small schooling fish + 8 corydoras + a bristlenose pleco |
| B | 1 small group of angelfish (manfish) + a school of medium tetras |
| C | 3–4 fancy goldfish with strong filtration |
| D | A planted community with several species of rasboras and tetras |
4 kaki and above
| Option | Example stocking |
|---|---|
| A | Large community: 30+ schooling fish, several bottom-dweller groups |
| B | A group of discus or angelfish |
| C | 1 juvenile arowana (moving to 5–6 kaki as it grows) |
| D | 1 oscar or a few medium cichlids with tankmates |
| E | 5–6 fancy goldfish |
Big fish like arowana, oscars and plecos are where most overstocking happens. If a fish grows over 30 cm, it needs a tank at least 4–6 kaki long as an adult.
Common Fish: Adult Size and Load
| Fish | Adult size (approx.) | Bioload | Minimum tank |
|---|---|---|---|
| Chili rasbora | 2 cm | Very low | 1 kaki |
| Neon tetra | 3–4 cm | Low | 2 kaki for a school |
| Guppy | 3–6 cm | Low (but they breed) | 2 kaki for a group |
| Betta | 6–7 cm | Low | 1 kaki for one |
| Corydoras | 4–7 cm | Low–medium | 2 kaki |
| Angelfish | 15 cm tall | Medium | 3 kaki |
| Fancy goldfish | 15–20 cm | High | 2 kaki for 2 |
| Common pleco (bandaraya) | 30–45 cm | Very high | 5–6 kaki |
| Oscar | 30 cm | Very high | 4 kaki+ |
| Arowana | 60–90 cm | Very high | 5–6 kaki for adults |
Signs Your Tank Is Overstocked
- Fish gasping at the surface, especially in the early morning or during hot afternoons
- Water turns cloudy or smells within days of a water change
- Nitrate climbs high between weekly changes
- Fish fight, chase or hide constantly
- Algae grows very fast
- Frequent disease or sudden deaths
If you see these, see our guide to why aquarium fish die.
How to Stock Safely
- Cycle the tank first. See our setup guide.
- Add fish in small batches every 1–2 weeks, testing ammonia and nitrite in between.
- Upgrade the filter before adding more fish. A filter turning over 4–6× the tank volume per hour suits most community tanks; goldfish and big fish need more. Compare options in filters.
- Leave room for growth and for fry if you keep livebearers.
- Choose a bigger tank if your wishlist doesn't fit. Browse tanks and stands.
What About Livebearers?
Guppies, mollies and platies breed constantly. A tank stocked with six adults can hold dozens of fry within months. Keep males only, plan to rehome fry, or let the tank's other fish eat some. Never release extra fish into drains or rivers: jangan lepaskan ikan ke sungai.
Frequently Asked Questions
Akuarium 2 kaki boleh isi berapa ekor ikan?
Lebih kurang 10 hingga 15 ekor ikan kecil seperti tetra, rasbora atau guppy, ditambah beberapa ekor corydoras. Kalau ikan emas, cukup 2 ekor sahaja kerana ikan emas banyak buang sisa.
Berapa ekor ikan emas dalam akuarium 3 kaki?
Kira-kira 3 hingga 4 ekor ikan emas fancy, dengan penapis yang kuat dan tukar air setiap minggu.
Can I put fish in a new tank right away?
No. Wait for the tank to cycle (usually 2–4 weeks in Malaysia), then add a few fish at a time.
Does a bigger filter let me keep more fish?
Partly. A stronger filter handles more waste, but fish still need swimming room and you still need regular water changes.
How many bettas can I keep together?
Only one male per tank. Female groups are possible in larger, planted tanks but can still fight.
Plan your stocking around the right tank and filter: browse tanks and stands and filters from Malaysian sellers on FishyHub, and see our best beginner fish guide for easy species.