Can you post a picture of one? It may help identify some disease.
Also, tell us more about your set-up, how many gallons, dimensions, lighting, what kind of substrate do you have, filtration, water flow etc...
Wow, looking at your signature, not only do you have too many fish in a 10 gallon tank, you don't have enough room for the fish to grow in. Some fish, when they are ready to grow and don't have the room, will die of stress.
Yes, marine salt, sea salt, or pond salt will work. I've used table salt in a pinch, but you'd need to flush the tank after a day because of the silicates they add to it.
Dose: 1 TBSP per 10 Gallons of water.
This will shock all the parasites and other bugs in the fresh water and eventually kill them. It will also add buoyancy for the fish.
Are any of your fish at the top of the water gasping for air? How is your Air Pump? Plenty of bubbles? How long does it take for the bubbles to burst once they reach the surface? Do they sort of look soapy? Do they accumulate, get big and take a few moments to burst? This is a sign of Phosphate, a deadly killer.
Do a 30% water change every day for a week and add another table spoon of salt every five days after the water change.
Are any of your fish at the top of the water gasping for air? How is your Air Pump? Plenty of bubbles? How long does it take for the bubbles to burst once they reach the surface? Do they sort of look soapy? Do they accumulate, get big and take a few moments to burst? This is a sign of Phosphate, a deadly killer.
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