Help!

[nicky2013]

Hi all, total newbie ere n need sum help......
I have had my tank for 3 wks now, 2wk ago i added 6 x zebra tetra, they seemed fine, then added 3 x dalmation mollies and a female fighting fish, they all get on great and all seems happy. Last night i noticed one of the mollies as a yellowish patch on its tummy (never noticed this when i got it) also as become very fat! any advise plz

 

[the_lock_man]

Initial assumption is that the fat molly is a female that is pregnant - these are livebearers, not egglayers, the eggs hatch whilst still in the female.
 
More of a worry is a 3 week old tank with that many fish in it - how big is the tank, and how regularly do you test and change the water?

 

[nicky2013]

My tank is 50l there is plenty of room and they all seem happy and settled. The shop i purchase my fish from have done several water sample tests and my water is fine. I have been doing weekly 25% water changes whilst adding 10ml of Micro-lift special blend until 4 wks when i add 5ml fortnightly. Would the yellow patch on her tummy be conected to possibly being pregnant?