i hv 16 goldy fries......in de 1st month de increased quickly...i fed dem daphnia ....but now de r not growing.....all of dem...i did not change de water 4 1.5 months....could dis be de reason......will de continur growing if i remedy de cause??

You should change the water now. Start with a 50% water change, very carefully temperature and pH matched and using Prime or Amquel or a good quality water treatment to get rid of chloramides and chlorine. With good water they should grow again Good luck.

Whoa 4 months no water change!!! No wonder never grow...

I think he means 6 weeks..

Yes, I think he means one and a half months (6 weeks). Even so, 6 weeks is a very very long time for fry to go without a water change. Follow Trinkets advice, get your water quality back on track and hopefully you'll see some growth. Water volume may also be an issue - what tank size are these 16 fry in?