Strange platy

[Bod]

I have a platy who keeps floating (the right way up) on the surface of the water, sometimes for hours. He then has a flurry and darts about the tank for a minute before going back up to the top. He is eating and doesnt seem to have a problem swimming when he gets going so I dont think he has a problem with his swim bladder. I dont know whether he is just lonley or if there is something wrong (if there is then I dont want to risk a new fish).
Any Ideas anyone? :?

 

[Menagerie]

[center:44eb2aa4cb] Welcome to AA, Bod! [/center:44eb2aa4cb]
Don't add any new fish and answer these Qs and we will figure out what is wrong with the platy.
~What are your tank parameters (ammonia, nitrites, nitrates, temp)?
~ How large is the tank?
~How many fish are in the tank? What kinds of fish are they and what are there current sizes?
~When is the last time you did a water change and vacuum the gravel? How often do you do this? How much water do you remove at a time?
~How long have you had the fish?
~How long has the tank been set up?
~Have you added anything new to the tank--decor, new dechlor, new substrate, etc.?

 

[Bod]

Hi
Our tank is approx 12 english gallons
The ammonia nitrate and nitrite are all 0
The temp is 24C
We set the tank up about 4 weeks ago and have had 6 neons, 2 guppies, a platy, a fighting fish and a bronze catfish added gradually.
The neons started dying a week ago (just after we got the platy and catfish) and are now all gone. All other fish have also died (the platy and the last guppie went today ) over the last few days except the catfish which looks perfectly healthy.
We dont know what to do now as we cant reset the tank because of the catfish.
Thanks

 

[oscarbreeder]

Sounds like it may not have been finished with the cycle.

Read the article on the nitrogen cycle in the articles section on this site.
Hope this helps.