Molly fish are a type of freshwater fish that are popular in home aquariums. They are peaceful fish that are typically good tank mates for other fish.
However, there have been reports of molly fish attacking and killing guppies. There are a few possible explanations for this behavior.
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Are male molly fish aggressive?
Male molly fish are aggressive towards other males in their territory in order to assert dominance and protect their mating grounds. They are also known to be very protective of their fry (baby fish). In the wild, male mollies will often chase away other fish that come too close to their fry.
Are black mollies aggressive to goldfish?
From what I can find, black mollies are not naturally aggressive to goldfish. However, there can be aggressive if the tank is too small or if there is not enough food.
If the tank is too small, the fish will be stressed and may become aggressive. If there is not enough food, the fish may become aggressive in order to protect their food source.
Are mollies aggressive to other fish?
Mollies are not naturally aggressive fish, but they can become aggressive if they are not kept in a proper environment. If mollies are kept in a tank that is too small, they can become aggressive towards other fish in the tank.
Mollies also need to be kept with other fish that are of similar size; if they are kept with fish that are much smaller than them, they can become aggressive and try to eat them.

Can mollies be aggressive to guppies?
Mollies can be aggressive to guppies for a variety of reasons. One reason is that mollies are naturally more aggressive than guppies.
Another reason is that mollies are larger than guppies, so they can bully them. Additionally, mollies may be aggressive to guppies because they are trying to establish dominance in the aquarium.
Are black mollies aggressive?
Aggression levels can vary greatly from one black molly to the next. However, in general, black mollies are not considered to be particularly aggressive fish.
They are typically peaceful and can coexist peacefully with other fish species in the same aquarium.
Why is my molly fish being aggressive?
There are a few reasons that your molly fish may be exhibiting aggressive behaviors. One possibility is that the fish is simply not well-suited for the tank it is currently in.
Mollies are known to be relatively peaceful fish, so if it is the only molly in the tank, it may be feeling stressed or threatened by the other fish. Another possibility is that the tank is not large enough for the molly.
Mollies need at least a 10-gallon tank in order to thrive, so if the tank is too small, the fish may be feeling cramped and stressed.
Another possibility is that the water conditions in the tank are not ideal for mollies. Mollies are freshwater fish, but they prefer slightly brackish water, so if the water in the tank is too fresh, the fish may be feeling uncomfortable.
The water should also be well-aerated and clean, with a pH between 7.5 and 8.5. If the water conditions are not ideal, the fish may be more prone to stress and aggression.
Finally, it is also possible that the molly is simply aggressive by nature. Some fish are just more prone to aggression than others, and there is not always a clear reason why.
If the molly is consistently exhibiting aggressive behaviors, it may be best to remove it from the tank and find a new home for it.
Can you keep guppy fish with molly fish?
Guppy fish and molly fish are both freshwater fish that can coexist peacefully in the same aquarium. They are both relatively small in size and have similar dietary needs.
Guppy fish are known for being relatively playful and active, while molly fish are more sedate and tend to stay near the bottom of the tank.
One thing to keep in mind when keeping these two species together is that guppy fish are known to be fin nippers. This means that they may nibble on the fins of their tank mates, which can be irritating and even painful for the molly fish.
To prevent this from happening, it is important to provide plenty of hiding places and plants for the molly fish to take refuge in.
Overall, guppy fish and molly fish can make good tank mates for each other. They are both peaceful fish that are relatively easy to care for.
Just be sure to provide plenty of hiding places and plants for the molly fish to help them feel safe and secure in their environment.
Why is my guppy attacking other fish?
Guppies are aggressive fish by nature, and will often attack other fish in the tank. There are a few reasons why your guppy might be attacking other fish:
1. It could be that your guppy is simply asserting its dominance over the other fish in the tank. Guppies are very hierarchical fish, and will often establish a pecking order within the tank.
If your guppy feels that it is at the bottom of the hierarchy, it may become aggressive in an attempt to move up in the ranks.
2. Guppies are also known to be fin nippers. This means that they will often bite at the fins of other fish in the tank.
This behavior is usually not harmful but can be annoying to the other fish.
3. Guppies may also attack other fish if they are feeling stressed or threatened. This could be due to a number of factors, such as poor water quality, lack of hiding places, or too much competition for food.
If your guppy is attacking other fish, it is important to try to identify the source of the stress and address it.
Why is my molly fish aggressive?
There are a few reasons why your molly fish may be appearing aggressive. One possibility is that the fish is not getting enough food and is feeling territorial over its food source.
Another possibility is that the fish is not comfortable in its environment and is feeling stressed. This can happen if the tank is too small, there are not enough hiding places, or the water quality is poor.
If the fish is aggression is directed towards another particular fish, it could be because that fish is of a different color or species and the molly is trying to assert dominance.
If you are concerned about your molly fish’s aggression, the best thing to do is to consult with a veterinarian or a qualified aquarium specialist. They will be able to help you identify the root cause of the problem and recommend the best course of action.
Are black molly fish aggressive?
In general, black molly fish are not aggressive. However, there are always exceptions to every rule and there may be some black molly fish that are aggressive.
If you have a black molly fish that is acting aggressively, it is best to remove it from the tank and place it in a separate tank by itself.
Why are my guppies dying?
If your guppies are dying, it is most likely due to poor water quality. Guppies are very sensitive to water conditions and even small changes can cause them stress.
Make sure to test your water regularly and take steps to keep it clean and stable. Also, be sure to check for other signs of illness such as lethargy, loss of appetite, and unusual behavior.
If you suspect your guppies are sick, consult a veterinarian who specializes in aquarium fish.
Can you mix guppies with molly?
It is generally not recommended to mix guppies with molly fish, as they can have different care requirements. Guppies tend to be more delicate, and need more frequent water changes and higher water quality in order to stay healthy.
Molly fish are more tolerant of poor water conditions but can be aggressive towards other fish. If you do decide to mix these two species, it is important to keep a close eye on the fish and make sure that they are all getting along.
Why is my molly attacking other fish?
Mollies are generally peaceful fish, but there are a few reasons why they might start attacking other fish. One possibility is that the molly is feeling territorial and is trying to protect its space.
Another possibility is that the molly is not getting enough food and is trying to compete for food with the other fish. Finally, it is also possible that the molly is sick or stressed and is taking out its aggression on the other fish.
If you notice your molly attacking other fish, it is best to observe the situation closely to try to determine the cause. If the molly is sick or stressed, you may need to provide additional care or treatment.
If the molly is simply feeling territorial, you may need to provide more space for the fish to swim.
In Summary
There are a few reasons why black molly fish might attack guppies and kill them. One possibility is that the black molly fish are feeling territorial and are trying to protect their space.
Another possibility is that the black molly fish are simply trying to eat the guppies, and they aren’t realizing that they’re causing harm. Whatever the reason, it’s important to keep an eye on the situation and make sure that the black molly fish don’t hurt any other fish.