Can Molly fish be aggressive?

While mollies are mostly peaceful, they will become very aggressive when crowded, which makes them feel threatened. Talk to your fish store owner about the different species of Mollhyfish and how many you should have in your size aquarium.

Are molly fish aggressive to each other?

Mollies are not typically aggressive, but if you have both female and male mollies, surely the signs similar to aggressive behavior when crowded or surrounded by aggressive tank mates. … This happens when the male molly chases a female molly or aggressively fights with another male molly in the tank.

Do Mollies eat other fish?

Yes it’s normal, it could be that they are breeding too. Mollies sometimes chase and attack other mollies while feeding but they will not cause that much harm.

Why are my molly fish chasing each other?

The reasons why Molly fish will chase each other and seem aggressive has to do mostly with mating rituals that involve attention-seeking behavior. Also, much like other animals, male mollies will become territorial and will attempt to defend their interests from the other males in the aquarium.

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Is Molly fish friendly?

Mollies are friendly, peaceful fish that generally get along with their tank mates well. They have been known to act territorial when around food and defending their homes, but as long as they have a large enough tank with suitable tank mates they will be just fine.

Do Mollies kill other fish?

Do Mollies kill other fish? Mollies can be somewhat rough with each other, but usually not to the point where they’d kill other fish. Adding 4 at the same time may have overloaded your system with ammonia, which can stress and kill fish. Add on top of that the aggression from the dominant molly, and you have dead fish.

How do I know if my mollies are mating?

Usually, a female goes vertical when she agrees to mate but I have noticed that the male mollies continue to chase the ones who are swimming away from them. Even if a female swims slowly it’s also the sign that she is agreeing to mate and allowing the male to chase her easily.

Do fish recognize their owner?

Of course, different species of fish will have different abilities, as well as different levels of vision. In most cases though, yes, fish are able to recognize their owners and in some cases form an attachment. … The fish will come over to their recognized owner who often offers a food treat or reward.

Can I keep a single Molly?

Thanks! Mollies like to be around other fish but you can keep one by its self. You need at least a 10 gallon and you do need a filter and heater. Beware when you get your Molly.

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What fish are good with Mollies?

15 Best Molly Fish Tank Mates – Fish & Invertebrates Compatible with Mollies

  1. Guppy Fish. Guppy Fish. …
  2. Endlers. Endler Guppy Fish. …
  3. Platy. Platy Fish. …
  4. Swordtail. Low-maintenance requirements and an oddly-shaped body make these fish an interesting addition to a community aquarium. …
  5. Neon Tetras. …
  6. Zebra Danio. …
  7. Minnows. …
  8. Corydoras.


How many Mollies Can I put in a 10 gallon tank?

Ideally, you should have a 10-gallon aquarium for a molly fish. Depending on the species, you may add up to four mollies to the tank. For Sailfins and other larger mollies, however, you’ll need to arrange a 30-gallon aquarium. To live comfortably, each extra molly will require about 3 additional gallons.

Why are my mollies so aggressive?

The reasons why Molly fish will chase each other and seem aggressive has to do mostly with mating rituals that involve attention-seeking behavior. This is when a male molly chases a female molly or aggressively fights off the other male mollies in the tank.

Why are my fish chasing each other?

Fish chase each other for a variety of reasons, such as defending their territory, establishing dominance, competing for food, and mating. Even fish that are typically docile fish may chase others because of constant stress. This could be due to incompatible tank mates, poor water conditions, or an overcrowded tank.

Do molly fish die easily?

Overfeeding causes mollies to produce a lot of waste, more than you’re removing with weekly water changes. With waste products accumulating and oxygen levels dropping, fish become ill and eventually die off.

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What is the lifespan of a molly fish?

The average molly fish lifespan is around three to five years. While they aren’t the longest-living freshwater species out there, there is some wiggle room depending on what species you get.

How long do molly fish stay pregnant?

Once the female is impregnated, she can give birth to as many as five or more broods of young at intervals of four to six weeks. The number of each brood may vary from 12 to 15 babies from a young Mollie to as many as 150 young from a large swordtail.

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