Water care for a Angelfish: 24 to 28°C, pH 6 to 7.5
Angelfish : Prefer soft, slightly acidic, well-filtered water with a 25 percent weekly change. Its long fins are vulnerable to nipping: avoid fin-nipping tankmates such as some barbs.
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🩺 Our hygiene and health advice stays general: it never substitutes for an examination by a veterinarian, the only person qualified to advise on your animal.
In short: 15 cm long and up to 20 cm tall, 240 to 300 L for a group, water between 24 and 28 °C. A majestic, slow cichlid, peaceful in appearance but territorial when breeding and a predator of very small fish. Its tall silhouette demands a tank at least 50 cm high; do not mix it with neons or shrimp, which it eventually eats.
The Angelfish’s water: its real parameters
The Angelfish’s water contract has four clauses: 24 to 28°C, pH between 6 to 7.5, zero detectable nitrite, nitrates capped at 25 mg/L. A drop-test kit (NO2, NO3, GH, KH, pH) beats any strip — and the nitrogen cycle, three to four weeks before any fish, is non-negotiable.
Water changes and tank upkeep
10 to 20% of the volume weekly, with water pre-heated to tank temperature: thermal shock stresses more than imperfect water, gentle substrate siphoning as you go and filter media rinsed in tank water, never under the tap: chlorine sterilises your filter.
Health: what stalks the Angelfish
Known watch-points: hexamita (hole-in-the-head) in loaded water and white spot disease after a temperature shock. Nearly every aquarium disease stems from degraded water or chronic stress: test the water BEFORE treating — medicine poured into loaded water makes everything worse. Well kept, a Angelfish lives 8 to 12 years.
Frequently asked questions
What water parameters for a Angelfish?
24 to 28°C, pH 6 to 7.5, zero nitrites and nitrates under 25 mg/L — checked with drop tests, not by eye.
How often should a Angelfish tank get water changes?
10 to 20% weekly, water brought to temperature, filter rinsed only in tank water. Consistency beats volume.
The guides that apply to you
- Axolotl Water Parameters: Temperature, Nitrite and Flow
What water parameters does an axolotl need? Cool temperature, zero ammonia and nitrite, gentle flow: the benchmarks for a sensitive amphibian.
- Should you change all the aquarium water? No, and here is why
Changing all the aquarium water destroys the bacterial balance and stresses the fish. Best practice: 10 to 25 % per week. Method and special cases.
- Changing filter media too often: the mistake that wrecks your aquarium's cycle
Why you should never replace all your filter media at once: nitrifying bacteria, replacement frequency and the right habits.
- Ammonia in an aquarium: why the same reading is harmless at pH 6.5 and lethal at pH 8
A water test shows 0.5 mg/L of ammonia: the real danger depends almost entirely on the tank's pH and temperature. The reference calculations explain this hundredfold gap.