There is a parasitic worm that causes black spot disease in fish. It causes small round black dots to appear on the body or fins. This does not look like black spot disease because the black marks are not uniform or round.
I would say it is most likely colouration from the fish.
If the fins...
The top picture has 2 fish in it (a yellow and a blue). The blue one is getting bashed by the fish in the bottom picture?
If you only have 4 fish in the tank, then the bully has taken over the tank and is trying to remove other males from the territory. The yellow fish is less of a concern to...
Come on people, if you have ever bred a fish, be it a lowly guppy, a cichlid, or something else, do the survey. It's safe and there is nothing in it to incriminate you. Even I did it and I'm an oversized Ewok with an eating disorder :werewolf:
IT'S FOR SCIENCE PEOPLE.
DO IT NOW.
If it has only been like that for a week it might be something else or a real fast growing tumour. The only things I can think of are parasitic louse that has gotten onto the gills, or a growth.
How long have you had the fish?
Have you added anything to the tank in the 2 weeks before you...
Hi and welcome to the forum :)
Do a huge water change and gravel clean the substrate.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
Do not add any salt because it doesn't treat white spot.
Keep the water temperature on 30C for at least another week...
People actually buy snails?
Mystery snails maybe, but Malaysian trumpet snails, death to them.
One species per tank/ container.
Have light on tank for up to 16 hours a day to encourage algae.
Feed 2-3 times a day.
Do big water changes and gravel clean substrate every week.
Low pH can slow or stop the nitrite bacteria but it has to be well below 6.0. If you are concerned, just do a huge water change and see if it helps.
Coldwater tanks take longer to cycle than tropical tanks because the bacteria reproduce slower in cold water.
If you have a...