Sick Platy - Advice Please

[Jennifer3]

Hello,
 
we have a community tank - platy's, mollies, neon tetra's, a betta and some peppered cory's
 
2 of the platy's appear to have clamped fin - not fanning their caudal fin or moving their back halves very much, swimming a bit wobbly
 
everyone else is fine.
 
Should we medicate the entire tank?  Or separate the ill fish - will this lead to more stress and impact them further?
 
50 gallon tank
fluval 306
2 air stones
ammonia - 0
nitrites - 0
nitrates - 10
pH - 7.3
 
we're new to the world of community tanks so could use all the advice we can get
 
Thanks

 

[bluesword23516]

Have you added any new fish or decorations recently? Do you see anything that isn't normal on the fish? What color is their poop? A photo will also help.

 

[Jennifer3]

nothing new had been added, there are no signs of parasites, ick or velvet.  Poop is a health beige colour and I'll see what I can do to upload a photo

 

[Jennifer3]

sorry I should have mentioned we have only had them for a couple of weeks - the tanks was cycled completely and we got all female mollies and platys but of course they were all pregnant - I'm hoping it is just stress?  I'm really not sure though.  If it's not and I see no signs of anything how do I treat and will it infect my entire tank?  I know...it depends on what it is right?

not a great pic, but she's still pretty active

 

[bluesword23516]

I am not sure, I don't think it would be caused by stress. Has she given birth lately? 

 

[Jennifer3]

possibly, we've picked 2 or maybe 3 batches of fry out of the tank, but with 3 mollies and 9 platy's, it's hard to tell who they belong to
 
There are 2 platy's who are not moving their caudal fins at all

 

[star4]

I would guess either internal parasites (livebearers are prone to these) or a bacterial infection. Have you noticed any stringy white faeces at all? if so treat with an internal parasitic medication (sorry not sure what you have available in Canada)
 
There is a list here that may help.
 
http/www.fishforums.net/index.php?/topic/138038-the-a-to-z-of-common-medications/