This stress can cause them to stop eating for a while, so you need to always make sure that their tanks are at the optimal temperature for their species.Ī fish that is introduced to a new aquarium may not eat right away due to the stress of a new environment. As a result, they will become more stressed when they find that they can’t breathe. This might not sound like such a bad thing, but it’s actually worse for your fish than swimming around in cold water.įish need to breathe oxygen as much as people do, and unfortunately, the hotter the water becomes, the less oxygen your fish will be able to properly absorb. If your fish tank is too hot, on the other hand, your fish could become hyperactive. This can slow down their metabolism and make them feel full when they really should eat, leading to unintentional starvation. If the tank becomes any colder than this, your fish may grow sluggish or move more slowly than normal. Most freshwater or reef fish thrive in water temperatures between 74 to 80 degrees Fahrenheit (or 23 to 26.5 degrees Celsius). In fact, you should never change anything in an aquarium too quickly, as this can stress out your fish.įish do just about everything in the water, so it’s very important that you regularly test their water parameters and change at least 10 to 15 percent of their tank water every week.įish can’t regulate their own body temperature like humans can, so they rely on you to keep their tanks at the optimal temperature for them. All fish are sensitive to abrupt changes in the pH or chemicals found in their water, no matter how hardy of a species you keep. Environmental Issuesīad water quality is one of the most common reasons fish suddenly stop eating. Luckily, most of these issues are easy to remedy, before any long-term consequences can impact your fish tank. Loss of appetite in fish can be due to a wide variety of factors. 2 What to Do If Your Fish is Not Eating.
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