Can we please offer a little more constructive advice rather than "They will all die you must return them"
Return all fishes pal. Cycle your tank or there just going to suffer and die. Or give them to a pal for a few weeks
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Hardly. If done following the directions of the link I provided the fish can and will live full happy lives. This requires a test kit (commonly API master) and regular testing / water changes. Many many many many people have successfully cycled a tank with fish in it. Myself included as I am currently cycling a tank with a $50 fish in it. If it couldn't be done safely there's no way I would do that. This is however more work than a fishless cycle with more chance for error.
The tank was cycled for 24hrs with water conditioner then the fishes were kept. Do i need to cycle the water again for 24hrs?
Cycling a tank involves a buildup of bacteria like was stated earlier. Fish food and waste break down into ammonia which is a highly toxic compound that accumulates in the water. There is a bacteria that will feed off of the ammonia and convert it into nitrites. Nitrites are another highly toxic compound. Finally, there is another type of bacteria that will consume the nitrites and convert it into nitrates. Nitrates are the least toxic of the three. This entire process can take anywhere from 1 month - 2 months on average. Expect to do 50% water changes every few days to keep the tank safe for inhabitants.
For a tank to be cycled it needs to convert the ammonia directly into nitrates without any detectable levels of either ammonia or nitrites.
For parameter levels you want to see:
Ammonia - Less than 0.5ppm
Nitrite - Less than 0.5ppm
Nitrate - Less than 40ppm
Anytime you get a reading in your tank that's higher than the suggested levels you need to do a 50% water change (unless there are problems with the source water) to rectify the situation.
For a test kit I recommend:
Amazon.com : API Freshwater Master Test Kit : Aquarium Test Kits : Pet Supplies