Molly sitting top of tank


New Member
Nov 24, 2020
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Staffordshire, England
Hi hope somebody ca help, we recently got two female mollies to go with our original male. But recently they keep sitting on the top of the tank. I also have tetras, angelfish, pleco and lots of shrimp. All the others are doing there normal thing. No obvious signs of anything being wrong apart from this. Any advice would be great, thanks!!


Fish Guru
Jan 26, 2008
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Perth, WA
Hi and welcome to the forum :)

Any chance of some pictures and second video of the fish?
If the pictures are too big for the website, set the camera's resolution to its lowest setting and take some more. The lower resolution will make the images smaller and they should fit on this website. Check the pictures on your pc and find a couple that are clear and show the problem, and post them here. Make sure you turn the camera's resolution back up after you have taken the pics otherwise all your pictures will be small.

If the video is too big for this website, post it on YouTube and copy & paste the link here. We can view it at YouTube. If you are using a mobile phone to take the video, have the phone horizontal so the video takes up the entire screen. If you have the phone vertical, you get video in the middle and black on either side.

What are the tank dimensions (length x width x height)?
How long has the tank been set up for?
How often do you do water changes and how much do you change?
Do you gravel clean the substrate when you do a water change?
What sort of filter is on the tank?
How often and how do you clean the filter?
What is the ammonia, nitrite and nitrate level in the tank?

What is the GH (general hardness), KH (carbonate hardness) and pH of your water supply?
This information can usually be obtained from your water supply company's website or by telephoning them. If they can't help you, take a glass full of tap water to the local pet shop and get them to test it for you. Write the results down (in numbers) when they do the tests. And ask them what the results are in (eg: ppm, dGH, or something else).

The following link has information about what to do if your fish get sick. It's long and boring but worth a read when you have some spare time.

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