depressed guppy

Hello!
im new here and i have a problem with one of my female guppies
i have a 20 gal tank with 3 female,one male and bunch of fry in it
tank is one year old,cycled,everythings fine and fish are doin great,tho about 2 months ago one of my females became Depressed after giving birth,she is not getting pregnant anymore,tho she looks healthy and eats fine
the only problem is she not acting normal,she swim alone most of the times and is not active like like she used to
ive found another post like this here,but since my fish is looking normal i think its a mental problem somehow,is there anything i can do? or she is gonna be like this forever?

Hi and welcome to the forum

Any chance of a picture and short 20 second video of the fish?

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The fish could have intestinal worms.

You can use Praziquantel to treat tapeworm and gill flukes. And Levamisole to treat thread/ round worms.

Remove carbon from filters before treatment and increase aeration/ surface turbulence to maximise oxygen levels in the water.

You treat the fish once a week for 3-4 weeks. The first treatment will kill any worms in the fish. The second and third treatments kill any baby worms that hatch from eggs inside the fish's digestive tract.

You do a 75% water change and complete gravel clean 24-48 hours after treatment. Clean the filter 24 hours after treatment too.

Treat every fish tank in the house at the same time.

Do not use the 2 medications together. If you want to treat both medications in a short space of time, use Praziquantel on day one. Do a 75% water change and gravel clean the substrate on day 2 & 3. Treat the tank with Levamisole on day 4 and do a 75% water change and gravel clean on day 5, 6 & 7 and then start with Praziquantel again on day 8.

The water changes will remove most of the medication so you don't overdose the fish. The gravel cleaning will suck out any worms and eggs that have been expelled by the fish. Repeating the treatment for 3-4 doses at weekly intervals will kill any worms that hatch from eggs. At the end of the treatment you will have healthier fish.

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To work out the volume of water in the tank:
measure length x width x height in cm.
divide by 1000.
= volume in litres.

When you measure the height, measure from the top of the substrate to the top of the water level.

There is a calculator/ converter in the "How To Tips" at the top of this page that will let you convert litres to gallons if you need it.

thank you for the answer, here are two pictures of her, i took it just now

and btw, after this happened i seprated her from the others for about 5 days and gave her medications for parasites just to be sure,but as ive said in the first post,she became like this 2months ago,i doubt if it was a parasite related thing she would be alive by now

and there is another question, i wonder can a fish become sterile for some reason? cause she is acting like one right now, she is acting ultra chill

The fish in the picture looks a bit yellow around the butt, which doesn't look normal. It also looks like the gills are a bit flared in the second pic, and the fins look a bit clamped. This could be stress related or the fish just happened to have its fins down when you took the picture.

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What medication did you use to treat her?

Fish can have intestinal parasites (worms) and gill flukes for months and act normally while infected by them. Eventually the fish gets run down and dies but it can take months or even years, depending on the severity of the infections.

With intestinal worms and gill flukes you need to treat all the tanks at the same time and do it each week for 3-4 weeks. The first treatment kills the adult worms/ flukes and the follow up treatments kill any baby worms that hatch from eggs.

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Fish can become sterile but it's not common. Most of the time when fish stop producing eggs/ young, it's caused by worms, bad food, or a dirty tank.

thanks for the reply,i used AZOO Magic disease treatment

its looks like with what u are saying,i should buy the AZOO ANTI-ENDOPARASITES since azoo is the only brand available to me right now,and u are saying i should treat all my tanks?