New tetras.. 2 died

[Lamie]

Remaining fish

 

[Deleted member 149562]

Glass surfing/zoomies is not always a sign of trouble. Most fish get out of the habit after a few weeks of arriving in a new aquarium but not all of them do (a few of mine still do it months after transfer to the larger aquarium, usually when the TV is on cos they can see it)

As long as the water chemistry is as it needs to be, your maintenance routine is kept up right then the glass surfing and glass zoomies can usually be put down to a fish taking on its reflection or just plain silly playtime.

As to the ones that are not living very long, there is every chance that it has nothing whatsoever to do with how you are caring for them and more to do with how they were bred and subsequently kept by the breeder/shop. It is sadly one of those things that happen sometimes. Out of almost every batch of fish bought, there is a reasonable chance that not all will make it to adulthood...birth defect, genetic issues...just as any animal, some will always be weaker than others, some will be more prone to ill health than others.

As long as you know your water chemistry is right and your maintenance is top notch, then you are unlikely to be the reason for the deaths. It happens more than people realise, doesn't make dealing with it any easier, but it does happen from time to time that fish die for no obvious or apparent reason and despite everything being perfect in their aquarium.

 

[Colin_T]

Your fish are breeding in the 1 minute video.

Some of the fish have more red around the gills than there should be. If the water is good, then are you adding any chemicals like fertiliser?
Does anyone use any sprays, perfume, aerosols, smoke, etc in the room?
Have you got buckets used specifically for the fish?

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They might have a gill fungus or gill flukes. Salt might help with that. Besides that, they all look pretty good.

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SALT
You can add rock salt (often sold as aquarium salt), or swimming pool salt to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, Bettas & gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.

The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.

After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.

If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.

When you first add salt, add the salt to a small bucket of tank water and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.