cycled tank but still having problems?

[Lady Hobbs]

How much oxygen is that filter giving you? Is it breaking up the waters surface well enough?

[moggsta]

i owned the platys now for 6 days..all fine up untill day 6 then they all died within the space of 12 hours...and my filter is bubbling away nicely i can see lots of little bubbles floating about all over the tank

[ameliaaahx]

Is there any possibility that any chemicals got into the tank? Its unusual to lose so many so quickly. Aerosols, deodorants, etc?

[Cermet]

Water parameters means ammonia, nitrIte, and nitrAte levels. A newly cycled tank can still have issues especially when you add a bunch of fish.

[moggsta]

i am not of aware of going anywere near the tank with any kind of chemicals...apart from stress coat when doing a water change..i have now done a 50% water change and only have two female swordtails which seem fine, i have had these two fish since my tank was cycled?

when will it be best to get a few more swordtails as i dont want anything else to die? i must leave them in there for a week by themselves

[Cermet]

You misunderstand - ammonia is produced by fish as a waste and it is toxic to fish; a fully cycled filter converts this waste into nitrite (very toxic) and then converts the nitrite into fairly safe nitrate. With a fully cycled filter, nitrates slowly build up and can start to become toxic (but need to get at/above 40 ppm.) that is why the tank's water must be partly changed every so often - to keep the nitartes i na safe range ... .

I understand you haven't put these chemicals into the water. You need to read about cycling since a filter that is not cycled will allow these deadly wastes to build up in your aquarium and kill the fish. Test kits are sold at all fish stores/prt stores that allow you to measure these toxians and better keep your fish healthy!

By the way, did you cycle your filter (takes four to six weeks) before adding all your fish?

[moggsta]

yes as stated before ive done a fishless cycle using biomature..this took 4 weeks..i use an api test kit and have 0.00 ammonia, 0.00 nitrate 10 nitrate so i know all about cycling and this is what i am annoyed about as i went through all that process, researched for months before i even got a tank, just for 8 fish to die?

[moggsta]

right so 3 days later my 2 surviving swordtails are still alive but looking lethargic now...:(

[imma24]

Have you been trying to adjust your pH or leaving it stable?

[sir kyle]

is your temp ok? that could've caused stress