Pasir Akuarium: Choosing Sand vs Gravel for Your Tank in Malaysia
Choosing between pasir akuarium (aquarium sand) and gravel (batu kerikil) comes down to your fish. Sand suits bottom-dwellers like corydoras, loaches and kuhli, which sift it with their mouths and can damage their barbels on sharp gravel. Gravel suits goldfish, livebearers and general community tanks, is easier to siphon, and lets water flow through so it is less likely to go stagnant. If you mainly want plants, aqua soil beats both. This guide covers which to choose, how deep to go, how to clean it, and whether cheap pasir silika or builder's sand is safe.
Sand vs Gravel at a Glance
| Factor | Pasir (sand) | Batu kerikil (gravel) |
|---|---|---|
| Bottom-dwellers (corydoras, loaches) | Best; safe for barbels | Smooth fine gravel only |
| Goldfish | Fine sand OK; they spit it out | Use large, smooth gravel they can't swallow, or sand |
| Cleaning | Debris sits on top; hover the siphon above | Debris sinks in; push the siphon into it |
| Water flow | Compacts; deep layers can trap gas | Water flows through |
| Plants | Fair; needs root tabs | Fair; needs root tabs |
| Look | Natural riverbed, beach | Classic, many colours |
| Undergravel filters | Not suitable | Suitable |
| Weight | Heavy | Heavy |
Choose by Fish Type
| Fish | Best substrate |
|---|---|
| Corydoras, kuhli loach, other loaches | Fine, smooth sand |
| Goldfish | Smooth gravel larger than their mouth, or fine sand |
| Guppy, molly, platy | Gravel or sand; either works |
| Betta | Any smooth substrate; avoid sharp gravel |
| Cichlids that dig | Sand (they move it constantly) |
| Shrimp | Aqua soil (Caridina) or fine gravel/sand (Neocaridina) |
| Plecos | Sand or smooth gravel |
| Planted tanks | Aqua soil, or sand/gravel with root tabs |
See our corydoras guide and kuhli loach guide for more on bottom-dwellers.
Types of Pasir Akuarium and Gravel
Fine aquarium sand
Natural or white sand sold for aquarium use. Rinse until the water runs clear. White sand looks bright but shows debris; darker sand hides dirt and makes fish colours pop.
Pasir silika (silica sand)
Many hobbyists use pasir silika sold for swimming-pool filters because it's cheap, inert and clean. It is usually safe if it's pure silica sand with no additives. Rinse thoroughly. You may see some brown diatom algae in a new tank with any sand; it normally fades once the tank matures.
Builder's sand (pasir bina / pasir sungai)
Builder's sand from hardware shops is not designed for aquariums. It often contains clay, silt, sharp particles, shells or traces of cement and lime, which can cloud the water and raise pH. If you want to try it, wash it many times, do the vinegar test (fizzing means carbonate), and test pH after soaking. For most people, aquarium sand or pool silica sand is the safer choice.
Gravel (batu kerikil)
Comes in sizes from 1–2 mm "pea gravel" to large river pebbles. Choose smooth, rounded gravel for fish that dig or have long fins.
Coloured gravel
Bright coloured gravel is popular for children's tanks. Choose quality coated gravel from aquarium suppliers; cheap coatings can chip over time. Coloured gravel doesn't harm fish when properly made, but it can make algae and waste more visible.
Coral sand and crushed coral
Raises pH and hardness. Good for African cichlids and marine tanks; avoid for soft-water fish and most planted tanks.
Browse options on FishyHub's gravel and sand page or the wider substrate category.
How Deep Should Sand or Gravel Be?
- Sand: about 2–5 cm. Deeper, undisturbed sand can develop low-oxygen pockets that smell of rotten eggs when stirred. Snails such as Malaysian trumpet snails help turn it over.
- Gravel: about 5–7 cm, more at the back if you want a slope.
- Planted tanks: 5–8 cm of soil or a sand/soil combination.
How much to buy
Length × width × depth (cm) ÷ 1,000 = litres of substrate. Sand weighs roughly 1.5 kg per litre.
| Tank (kaki) | Footprint | 3 cm sand | 5 cm gravel |
|---|---|---|---|
| 1 kaki | 30 × 20 cm | ~2 L (~3 kg) | ~3 L |
| 2 kaki | 60 × 30 cm | ~5.5 L (~8 kg) | ~9 L |
| 3 kaki | 90 × 45 cm | ~12 L (~18 kg) | ~20 L |
| 4 kaki | 120 × 45 cm | ~16 L (~24 kg) | ~27 L |
Cleaning Pasir Akuarium vs Gravel
Before adding
Rinse sand and gravel in a bucket, stirring with your hand under running water, until the water is nearly clear. Sand takes longer. Aqua soil should not be rinsed.
Routine cleaning
- Gravel: push the gravel vacuum into the substrate during water changes so it lifts trapped waste.
- Sand: hover the siphon just above the surface and let it pick up debris without sucking sand. Pinch the hose to control flow.
- Clean one section each week rather than the whole floor at once.
Siphons and gravel cleaners are in the cleaning and maintenance range. Our cloudy water guide helps if a new substrate leaves the water murky.
Malaysia-Specific Tips
- Soft tap water: some sands and gravels contain carbonate and can raise pH. Usually that's minor, but for shrimp and soft-water fish, test before and after.
- Heat: warm tanks speed up decay of trapped waste, so don't skip substrate cleaning in hot months.
- Weight: a 3 kaki tank's sand can weigh close to 20 kg, on top of water and rock. Keep this in mind on upper floors.
Frequently Asked Questions
Pasir silika selamat untuk akuarium ke?
Biasanya selamat jika ia pasir silika tulen untuk penapis kolam renang, tanpa bahan tambahan. Basuh berkali-kali sampai air jernih sebelum masukkan ke dalam akuarium.
Pasir atau batu kerikil, mana lebih bagus untuk ikan corydoras?
Pasir halus lebih bagus untuk corydoras kerana ikan ini suka korek dasar dengan mulut. Batu kerikil yang tajam boleh rosakkan sesungut (barbel) mereka.
Can I use builder's sand in my aquarium?
It's risky. Builder's sand may contain clay, lime or cement residue and sharp particles. If you try it, wash it many times and test pH. Aquarium sand is safer.
Does sand cause bad smells?
Deep, never-disturbed sand can trap waste and form low-oxygen pockets. Keep sand shallow, siphon the surface and add burrowing snails.
Can plants grow in sand or gravel?
Yes, especially root feeders like crypts and swords, if you add root tabs. Epiphytes like anubias don't need substrate at all.
Find the right base for your tank from Malaysian sellers on FishyHub: browse gravel and sand, aquarium soil and our aquarium soil guide.