To me, looks like stress. I've had mollies do the same, not from lack of oxygen or anything, just...stress. Does he get picked on? I'd be more worried if he were listless and gasping, or with red gills.

 

I haven't seen any major bullying, but it's too late for him. Found him dead on the gravel. I'll watch the others for signs in the future, but for him it was too little too late. Thanks for letting me know it was probably stress.

 

I'm sorry. How long did you have your platies and where did you get them? I have discovered that platies from Petsmart tend to be ill and die quickly.

 

I agree. Platys from petsmart seem to always be sick...May be just because of ill-breeding.

 

They were all from Petsmart except for my Zebras which came from Petco. I just had another who did the same thing except he stayed at the top. Again my parameters are the same. Makes me think that I didn't get the healthiest of fish when I went.

i'll be going to Petco next time to see if things go better. The rest are looking fine for now. Also forgot to mention I use the api master test kit so I'm sure about my readings.

 

Always triple check the tanks before buying: lethargic fish, dead or dying fish, diseases including parasites.