Cichlid Water Parameters (pH + Temp)
Short answer: The median cichlid tank runs pH 7.5 and 78 F, but that blended number hides a split: African cichlids need hard, alkaline water (pH 7.8-8.6), while South Americans thrive in soft, acidic conditions. Data from 105 real cichlid tanks.
Across 105 real cichlid tanks that reported water tests in the AquaGauge dataset (July 2026 snapshot), the median tank runs pH 7.5 and 78 F. But that single number is misleading. Cichlids span over 1,300 species across two continents, and African rift-lake cichlids need the opposite water chemistry from South American species like discus and rams.1 The real answer depends on which type you keep.
What real cichlid keepers actually measure
| Parameter | N (tanks) | Median | Mean | IQR (Q1-Q3) | Full range |
|---|---|---|---|---|---|
| pH | 45 | 7.5 | 7.4 | 7.4-7.8 | 4.0-9.0 |
| Temperature (F) | 22 | 78 | 79.5 | 77.8-82 | 76-86 |
| Nitrate (ppm) | 67 | 20 | 32.5 | 10-40 | 0-200 |
| Ammonia (ppm) | 44 | 0 | 2.2 | 0-0.04 | 0-40 |
The pH range of 4.0-9.0 is the widest of any species group in our dataset. That is not noise. It reflects two distinct populations: African cichlid keepers running alkaline water (pH 7.8+) and South American cichlid keepers running acidic to neutral water (pH 6.0-7.5). Blending them into one median obscures the split.
African cichlids: hard and alkaline
African rift-lake cichlids (mbuna, peacocks, haps from Lake Malawi; frontosa and shell-dwellers from Tanganyika) evolved in some of the hardest, most alkaline freshwater on Earth. Target parameters:
- pH: 7.8-8.6
- GH: 10-25 dGH
- KH: 10-20 dKH
- Temperature: 76-82 F
Most of the readings above pH 7.8 in our dataset come from these setups. The 73% of all cichlid readings between pH 7.0 and 8.0 clusters around the overlap zone where both African and American keepers land.
If your tap water is naturally soft (GH under 8, pH under 7.5), African cichlids need a buffer. Crushed coral in the filter or a rift-lake buffer product raises KH and stabilizes pH in the 8.0-8.4 range. The full pH guide covers adjustment methods.
South American cichlids: soft and acidic
Oscars, severums, angelfish, rams, and Apistogramma come from soft, acidic rivers in the Amazon and Orinoco basins. Target parameters:
- pH: 6.0-7.5
- GH: 3-10 dGH
- KH: 2-8 dKH
- Temperature: 76-82 F (discus: 82-86 F)
The 9% of readings below pH 6.5 in our dataset are almost entirely South American setups. Discus keepers in our separate discus dataset run a median pH of 7.0 with an IQR of 6.5-7.6. Captive-bred South American cichlids adapt to neutral water (pH 7.0-7.5), but wild-caught fish and breeding pairs do better with softer, more acidic conditions.
Driftwood and Indian almond leaves naturally lower pH and soften water. RO water mixed with tap gives precise control for sensitive species. See the discus water parameters guide for the full breakdown on the most demanding SA cichlid.2
Nitrogen: cichlids run a heavy bioload
Nitrate: The median is 20 ppm (IQR 10-40). That is double the discus median of 10 ppm, reflecting the heavier stocking densities common in African cichlid tanks. 67% of cichlid keepers stay at or below 20 ppm. The 15% above 40 ppm are in the danger zone for long-term health.
Ammonia: The median is 0 ppm. Any detectable ammonia signals a problem. At the higher pH that African cichlid tanks run (pH 8.0+), a larger fraction of total ammonia exists as toxic free NH3. A reading of 0.25 ppm at pH 8.2 is more dangerous than the same reading at pH 6.5. See safe ammonia levels for the full chemistry.
Cichlids in a 70-gallon median tank need oversized filtration. A canister filter rated for 1.5-2x the tank volume, combined with weekly 25-30% water changes, keeps nitrate under control.
African vs. South American: side by side
| Parameter | African (rift-lake) | South American | Discus |
|---|---|---|---|
| pH | 7.8-8.6 | 6.0-7.5 | 6.5-7.6 (median 7.0) |
| GH | 10-25 dGH | 3-10 dGH | 2-8 dGH |
| Temperature | 76-82 F | 76-82 F | 82-86 F |
| Nitrate target | under 20 ppm | under 20 ppm | under 10 ppm |
| Water change | 25-30% weekly | 25-30% weekly | 30-50% 2-3x/week |
The temperature overlap is large. The pH and hardness gap is not. Mixing African and South American cichlids in one tank forces a compromise that stresses both groups. Pick one continent and match your water chemistry to it.
How we counted
AquaGauge compiled cichlid setups from public Reddit posts (r/Cichlid) where keepers shared water test results. Across 515 total posts in the subreddit, 105 tanks reported at least one water parameter: 45 pH readings, 22 temperature readings, 67 nitrate readings, and 44 ammonia readings. Each parameter has its own sample size because not every post reports every number. The blended statistics combine African and South American setups; we note the split throughout. Full methodology at /methodology/. Figures are from the July 2026 snapshot (6,414 tanks total).
Check your exact stocking
Add your fish below to see stocking %, filtration load and compatibility for your setup — live.
Stocking — under 85% comfortable · 85–100% full · over 100% overstocked
Show the math
Gear for this setup
As an Amazon Associate AquaGauge earns from qualifying purchases. Some links below are affiliate links, at no extra cost to you. Current price and availability are shown on Amazon. Disclosure.
-
API Freshwater Master Test Kit Liquid reagent tests for pH, ammonia, nitrite, and nitrate cover the four parameters every cichlid keeper needs to track weekly. Check price on Amazon → -
API 5-in-1 Test Strips (25 ct) Covers GH and KH, which the Master Kit misses. Essential for African cichlid keepers who need to monitor hardness. Check price on Amazon → -
Fritz Rift Lake Cichlid Buffer (1.5 lb) Raises KH and pH for African cichlid tanks where tap water is too soft. Dial in rift-lake alkalinity without chasing pH with baking soda. Check price on Amazon →
FAQ
- What pH do African cichlids need?
- 7.8-8.6. African rift-lake cichlids from Lakes Malawi and Tanganyika evolved in hard, alkaline water. FishBase lists pH 7.2-8.8 for many mbuna species. In our blended cichlid dataset (median 7.5), the high-pH cluster reflects these keepers.
- What pH do South American cichlids need?
- 6.0-7.5 for most species. South American cichlids (oscars, severums, rams, angelfish) come from soft, acidic rivers. Discus keepers in our dataset run a median pH of 7.0. The 9% of readings below 6.5 in the blended cichlid data are largely SA setups.
- What temperature do cichlids need?
- 76-82 F covers most cichlids. The median across the 22 cichlid tanks that reported temperature is 78 F (IQR 77.8-82). Discus are the outlier at 84 F. Most African and mid-size American cichlids do well at 76-80 F.
- How often should you test cichlid water?
- Weekly, at minimum. Cichlids produce heavy bioload relative to their tank size, and African cichlids in particular are sensitive to pH drops caused by nitrate buildup. Test pH, ammonia, and nitrate every week, and GH/KH monthly for rift-lake setups.
Sources
- Family Cichlidae - Cichlids, FishBase. View source ↗
- Symphysodon aequifasciatus, Seriously Fish. View source ↗
Freshwater aquarist of 8+ years.