rosy tetra dying??

[deadmanwalking]

i, just 10 minutes ago I noticed one of my rosy tetras swimming upside down (more floating but still breathing) in my tank (it looks like swim bladder to me), so we took it out and put it in a tiny container so it doesnt need to fight against the current, and although it still looks hurt it is still swimming (this container is like tiny - less than 1 litre) and my dad wants to keep it in there for tonight till morning so it doesnt get picked on by the firemouths or other rosy tetras in my tank, but I dont want to due to the unstable temperature conditions in that size of (I wouldnt even call it a tank).

I heard feeding them peas could help, but we only have tinned mushy peas and I cant see them helping. Is there anything else I can do to help???

Please reply to this if you know something, I really dont want this fish dying on me.

The tank is 6 gallons and has been set up for months although we recently drained the water for like 10 minutes and revamped everything before putting tank water back into the tank. We just done a 50% water change (some water from my 33 gallon, some new water).

Please let me know if you need any more information, for example pictures or water parameters. I didnt include water conditions here though because I want to try and make sure it doesnt die before I work out why this happened.

Thanks!

 

[Aquanero]

Put about 1/4 teaspoon of disolved epsome salt in the container. Leave the fish in it for 15 mins. remove the fish and put it in the biggest net you have and let it stay in that in the main tank. This will allow it to rest without being picked on.

Get a test kit and test your water for Ammonia, nitrite, nitrate and PH. Any sign or ammonia or nitrite will inducate an uncycled tank. Nitrates should be kept under 20 ppm.

Use white fonts if you can the post is very diffacult to read without highliting it.

 

[deadmanwalking]

Thanks and sorry about the text, I copy and pasted it from another tab lol. So we cleared the tank out completely again and while doing so discovered 1 dead rosy tetra and one missing firemouth (cant find it anywhere!). We then put the 2 remaining tetras back in to the tank and they are fine! however, they are very sensitive now - whenever I tap the glass they go nuts (I tapped the glass because they were already going nuts by themselves) and they are darting across the tank into filters and each other now.

I think it may be because there is only 2 though, maybe getting the numbers back up will help them?