Female black molly is probably sick HELP

[New at this]

I am pretty new at this and I noticed Two days ago that my female black molly had black spots on her tail fin. They were not there before. She has had 10 fry up to my knowledge. She seems to attack the other fish and the male i bought with her died shortly after getting both. Any idea on what it is wrong?

 

[FishGuest5123]

Can you get a pic of her?

 

[Colin_T]

Tank size:
pH:
ammonia:
nitrite:
nitrate:
kH:
gH:
tank temp:

Fish Symptoms (include full description including lesion, color, location, fish behavior):

Volume and Frequency of water changes:

Chemical Additives or Media in your tank:

Tank inhabitants:

Recent additions to your tank (living or decoration):

Exposure to chemicals:

Digital photo (include if possible):

 

[New at this]

Tank size: 10
pH:
ammonia:
nitrite:
nitrate:
kH:
gH:
tank temp: 77°

Fish Symptoms (include full description including lesion, color, location, fish behavior): she has been attacking the other fish exept my pepered catfish and her tail fin has black spots that were not there before

Volume and Frequency of water changes: 1 per two weeks about 25-30%

Chemical Additives or Media in your tank:cleaning bactiria,stress coat,bactiria supplement,aquasafe plus

Tank inhabitants: two gold molly fish. Two pepered cory cat fish. Three fish that i don't remeber the names of(they are orange half black and their tail is moon like) and her 10 fry 2 of which are 4 months older then the other 8

Recent additions to your tank (living or decoration): all are plastic

Exposure to chemicals:

Digital photo (include if possible):

 

[New at this]

Can you get a pic of her?

I could not post the photo

 

[FishGuest5123]

I could not post the photo

Sometimes I have to get back and then zoom in to get it to fit.

 

[New at this]

Sometimes I have to get back and then zoom in to get it to fit.

 

[FishGuest5123]

It just looks like pigmentation. They can pop up overnight. I don’t think it’s anything to worry about but let’s see what some of the disease guru’s say. @Colin_T, what do you think? @essjay? Is it acting ok otherwise? Mollies can be nippy sometimes. Is your tank cycled? I noticed you didn’t put down your ammonia, nitrites, and nitrate readings.

 

[New at this]

It just looks like pigmentation. They can pop up overnight. I don’t think it’s anything to worry about but let’s see what some of the disease guru’s say. @Colin_T, what do you think? @essjay? Is it acting ok otherwise? Mollies can be nippy sometimes. Is your tank cycled? I noticed you didn’t put down your ammonia, nitrites, and nitrate readings.[/Q

i don't even know what cycled means. My first bunch of fish died of ich because emmonia levels were probably through the roof. I don't have the tools necessary to read these so i have no idea. Where can i get them exactly?( English is not my first language excuse my typos )

 

[Colin_T]

How long has the tank been set up for?

Cycling an aquarium is where the filters develop colonies of beneficial bacteria that convert ammonia into nitrite and then nitrate. This normally takes around 4-6 weeks and during that time you can get ammonia or nitrite readings, which harm the fish.

Ammonia is produced by anything that breaks down in the water, be it fish food, fish waste, dead fish, rotting plant.

When an aquarium is cycling with fish in, you should only feed the fish a couple of times a week and do a 75% water change and gravel clean the substrate 4-8 hours after feeding.
If the tank has finished cycling you can feed the fish every day and a do a 75% water change and gravel clean the substrate once a week.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

You can buy test kits to check the ammonia, nitrite, nitrate pH and other things. Or you can take a glass full of tank water to the local pet shop and ask them to test it for you. Write down the test results in numbers when they do the tests. If the shop says the water is fine, ask them what the results are in numbers.

-------------------------
What sort of filter do you have?
What materials are in the filter?
How often do you clean the filter?
How do you clean the filter?

-------------------------
How long have you had the fish for?
How long has the fish had the black spots for?
Have you added anything new to the tank in the 2 weeks before this started?

It looks like colouration and the only disease that produces black spots is black spot disease. However, that is rare in domestic fish and the spots from black spot disease are bigger and appear all over the body and fins.

As long as the fish is feeding well, I wouldn't worry too much. But monitor the spots and if they get bigger or change shape, then post more pictures here.

 

[New at this]

The tank has been set for 5 months at most. The spots dont seem to change. There was growth of something in the filter. I just assumed it was algae so i chaged the filter. They seem fine right now but she still goes out of her way to nip at the others. Can the amount of space affect them?
I only clean the filter when i see its dirty or its been a month

 

[Vorpal]

When did you change the filter? Did you put a completely new one in?

 

[New at this]

When did you change the filter? Did you put a completely new one in?

Yes

 

[Colin_T]

I wouldn't worry about the colour on the fish but you need to modify your filter and stop replacing the filter pads.

You can buy square or rectangular sponges for various brands of filter. You can cut these sponges with a pair of scissors so they fit in the filter. After the sponges have been in the filter for 2 months, you can remove the filter pads and dispose of them, leaving the sponges behind. You can add more sponges to replace the cartridges after you remove them.

You can also get round/ cylindrical sponges for some brands of internal power filter. These sponges have a hole through the centre and they fit over the intake strainer of most external power filters.

Sponges will last for years and don't get replaced unless they start to fall apart.

To clean sponges you simply squeeze them out in a bucket of tank water and when they are clean, put them in the tank. Wash the filter case under tap water, then set the filter back up and get it going again.

If you replace the filter pads/ cartridges, you get rid of the beneficial filter bacteria and this can cause problems with ammonia and nitrite levels building up in the water, and this can kill the fish. Adding sponges to the filter means you don't have to replace anything, which saves you money and keeps the water more stable.

 

[TO KYO]

I am pretty new at this and I noticed Two days ago that my female black molly had black spots on her tail fin. They were not there before. She has had 10 fry up to my knowledge. She seems to attack the other fish and the male i bought with her died shortly after getting both. Any idea on what it is wrong?

Mollies change of color as they grow. Maybe the lighting or the food is changing her color