Hmm, I am not sure now. I bought them from fish shop they are called variatus platy. The staff told me to keep them in room temperature. Some people said if the temperature is high for cold water fish, it stimulate their metabolism too fast and shorten their life. But then some said if the fish ill, I should increase the temperature in the hospital tank.
I just done the water change, she clearly don't like it, but will keep going hopefully will help her. I actually suck up the waste daily to and fill up treated water when the water level get low, just those few days away that i wasn't able to clean the tank. It could be why, but i will get a test kit to keep the water monitor. Thanks again for your advice. Greatly appreciated.
About the tank size, I am worry if any bigger than 20L, I probably could not maintenance that regularly, but will see when they grown. Thanks for the recommendations.
Thank you so much for everyone in the forum for all your help, hopefully the little one can make it
I do agree that a larger tank would do them well, platys do not get very big but they do produce a large amount of bioload. I, personally, have a controversial opinion on stocking- if your fish cannot outgrow your tank and they have plenty of turning around space, and as long as you can take care of the water needs (whether the water changes is just once a week or more) then you should be okay. I use AQAdvisor Stocking Calculator to make the majority of my stocking decisions.
Here is what I have on platys:
Feeding:
You can easily overfeed platys and other livebearers as they tend to over eat. They do not have an efficient way to say they are full and being bloated can cause a lot of harm to their internal organs.
Only feed them once/twice a day depending on your water parameters.
Water Parameters for Livebearers:
Livebearers are hard water fish, needing upwards of 160-220ppm gH.
pH should be around 7.2-7.6.
Temp should stay around 74-82 degrees fahrenheit (23-28 celsius, as I see you are from England).
No ammonia or nitrites should be present, if they are, please do a large (75%) water change.
Nitrates should stay below 20ppm.
To test these things, purchase an API Liquid Testing Kit from your local pet store or online.
Tank Size:
Bigger is always better for livebearers, they don't necessarily require a load of space but they do produce a lot of bioload and if you cannot keep up with the water changes in a smaller tank, then you need to buy a bigger tank.
I recommend a minimum of 10g tank for the livebearers but most people will say 20g works best.
Hope this helps, I see everyone has given some input as well. If you have any questions, feel free to reply to any of us.