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sciencing.com/can-ph-affect-fish-12101588.html

Fish and other aquatic animal and plant life require the water they live in to be a certain pH level in order to be healthy. If the pH level is too low or too high, it can make fish sick, even kill them. A low pH means that the water is acidic; a high pH means that the water is alkaline. What is pH? The term pH ...

www.lenntech.com/aquatic/acids-alkalis.htm

It will strip a fish of its slime coat and high pH level ‘chaps’ the skin of fish because of its alkalinity. When the pH of freshwater becomes highly alkaline (e.g. 9.6), the effects on fish may include: death, damage to outer surfaces like gills, eyes, and skin and an inability to dispose of metabolic wastes.

tankk.com/2015/12/04/effect-of-ph-level-on-freshwater-aquarium-fish

The pH level defines acidity or base degree of water and most freshwater aquarium fish survive within a range of 5.5 to 7.5. Small change in pH levels will affect aquarium fish and it may lead to stress or even fish death. According to experts, pH level of a water tank affects the breathing ability […]

www.answers.com/Q/How_does_the_pH_affect_a_fish_population

The pH can affect the fish population in different ways depending on how tolerant the fish are to acidity in water. The pH scale is used to measure the degree to which your aquarium's water is ...

www.fondriest.com/environmental-measurements/parameters/water-quality/ph

While ideal pH levels for fish are 7-8 (fish blood has a pH of 7.4) ²⁰, most fish can adapt to the pH level of their environment (6.0-9.0) as long as there are no dramatic fluctuations. A dramatic fluctuation is considered a shift in pH of 1.4 (up or down) ²². For saltwater fish, the pH of water should remain between 7.5 and 8.5 ⁹.

www.myaquariumclub.com/how-does-ph-affect-your-fish-10434.html

How does pH affect your fish? Share. First of all, a stable pH is many times better than an unstable one. Even if it’s higher than what the books say about your fish. Experiment with pH up, down, sideways or whatever those bottles are called almost never ends well. Not surprising if you realize that pH is measured on a logarythmic scale.

www.quora.com/How-does-a-low-pH-level-affect-an-aquarium

Well, that depends. There are a number of potential affects that low pH can have on an aquarium, some good some bad. Like so many things in this hobby (and many of the answers we give), it all depends on your tank. Certain fish have evolved to thr...

animals.mom.me/effect-aquarium-plants-ph-5049.html

While aquarium plants can affect pH, pH also can affect aquarium plants. Like fish, plants typically are adapted to the water chemistry of their home waters. For example, Amazon plants, like the Amazon swordplant, prefer soft, acidic water. Conversely, Egeria has adapted to hard, alkaline water, and does best in aquariums that mimic this water ...

animals.mom.me/symptoms-high-ph-aquarium-10722.html

Potential hydrogen, often called pH, is a measurement of acidity. A substance with a measurement of 0 to 6.9 pH is acidic, while a pH of 7.1 to 14 is considered alkaline. Most aquarium fish thrive in pure water, which is a neutral pH of 7. A tank with high pH, meaning it's very alkaline, is dangerous for fish and ...

www.thesprucepets.com/saltwater-aquarium-ph-control-2924058

The pH level in a saltwater aquarium is a constant concern to most marine aquarists. Whereas the occupants in a fish-only system can tolerate a fairly wide range of pH levels for periods of time with no major harm, the occupants of a reef tank, which includes both fish and invertebrates, rely heavily on a constant pH level in the right range just to survive, let alone thrive.