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As far as I know, this is because cold water is heavier than warmer water. Hot/Warm water rises to the top, while colder/cooler water sinks to the bottom. The fish will go along. improved answer: "Even if the above answer is true, which i believe is not, it still wouldn't matter at all: it wouldn't actually have an effect on the fish. There is no responsible way to answer this question with the provided information. There are multiples reasons why a fish would be lying on the substrate. My first idea would be that the fish is having respiritory trouble because of poorly oxygenated water. Which is more of a concern in cold water than tropical."

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16y ago

What else can I help you with?