Feeder Fish Water Parameters Cheat Sheet
Keep this handy. The exact temperature, pH, and water-quality targets that keep feeder guppies healthy and stress-free in a holding tank.
Guppies are hardy, but feeders are often young and kept at higher density, so stable water is what keeps them alive. Aim for these targets and test regularly.
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Temperature
target 74–78 °F
pH
target 7–8
Ammonia
target 0 ppm
Nitrite
target 0 ppm
Nitrate
target 0–40 ppm
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Target ranges
- Temperature: 72–80°F (22–27°C); 74–78°F is the sweet spot
- pH: 7.0–8.0 — guppies prefer slightly alkaline, hard water
- Ammonia (NH3): 0 ppm, always
- Nitrite (NO2): 0 ppm, always
- Nitrate (NO3): below 40 ppm; do a water change to bring it down
- General hardness (GH): 8–12 dGH
- Carbonate hardness (KH): 4–8 dKH for pH stability
Why each one matters
Ammonia and nitrite are acutely toxic — any detectable amount is an emergency, and the fix is an immediate water change plus more biological filtration. Nitrate is less toxic but stresses fish over time. Stable temperature and pH matter as much as the absolute numbers; swings are more dangerous than a value that is slightly off but steady.
When in doubt, change the water
A 30% change with dechlorinated, temperature-matched water fixes more feeder-tank problems than any product on the shelf.
Quick troubleshooting
- Fish at the surface gasping → low oxygen or high ammonia; add aeration and change water
- Clamped fins, lethargy → check ammonia/nitrite first, then temperature
- Rapid breathing after adding fish → acclimation was too fast or temperature mismatched
- pH crashing over time → low KH; add a buffer or crushed coral
When in doubt, change the water. A 30% change with dechlorinated, temperature-matched water fixes more feeder-tank problems than anything else.
Frequently asked questions
What temperature do feeder guppies need?
74–78°F is ideal. The wider tolerable range is 72–80°F, but avoid swings.
What pH is best for guppies?
Slightly alkaline, 7.0–8.0. They like harder water than many tropical fish.
My ammonia is not zero — what now?
Treat it as an emergency: do a large water change immediately and boost filtration. See holding-tank setup.
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