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My tropical community is in the high 70s to low 80s range and my fish are quite healthy, but if I added goldfish to this water they would not survive very long as the ideal temperature for them maxes out at 76 degrees.
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Goldfish require a water temperature of 68 to 75 degrees Fahrenheit and most tropical fish require a temperature of 76 to 80 degrees, depending on the species you keep. The Temperature Range Is Completely Different In tropical community aquariums, the ammonia levels should be 0. If you have goldfish, I challenge you to either buy an API Master Test Kit or take your water to your local fish store for them to test. To fight high levels of ammonia, you can do frequent water changes and/or use chemicals from pet stores. This will allow them to produce less waste and therefore less ammonia. On the other hand, tropical fish have stomachs which means they should theoretically stop eating when they are full. Goldfish would eat a pinch of food every ten minutes or so if you let them which means that they will produce more waste and therefore more ammonia. When they eat, their bodies absorb the nutrients they need for survival and the rest is quickly expelled from their system in the form of feces. This means that goldfish are never “full” and will eat all day if you allow them to. The reason goldfish produce so much ammonia is that they don’t have a stomach and therefore don’t hold any of their food. Ammonia mostly comes from fish feces and pollutes the water to deadly levels. One of the main causes of disease and death in tropical fish is high levels of ammonia. Goldfish Eat, Defecate, and Produce Ammonia This is not to say that you should put them together, but it does show that there are more reasons that aggression to not house certain species together. However, goldfish are very peaceful and get along quite well with other peaceful tropical community fish.
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For example, if I said that you couldn’t put a male betta with an angelfish, most people would automatically assume aggression problems because they have background knowledge of bettas. Often times when people think about not being able to keep two kinds of fish together, they often think of aggression and not being able to get along. Anyway, his water was always cloudy and he could not figure out why all of his fish were dying – until after I told him the truth about goldfish and tropical fish. From what I can remember, he had about 4 goldfish and maybe 6 other small tropical fish. He did not properly research any types of fish before he started stocking his tank with some animals from Pet Smart. I remember about 18 months ago, my father purchased a 55 gallon aquarium at a yard sale to put in his living room. They not only know what they are talking about, but they are willing to share that information with you instead of allowing your fish to die. This is one reason why shopping at a local fish store (as opposed to a chain store) is beneficial. If I walked into Petco today and ask for 5 goldfish, 3 mollies, and 4 neon tetras, the employee would put them all in breather bags and never ask me a single question about my setup. Before I start blaming the owner, I would like to say that large chain stores like Petco and Pet Smart do not properly inform customers that these two types of fish cannot be placed together. One of the most common mistakes beginning pet owners make is mixing goldfish with tropical fish.
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