Help,, sick young ones,,80% died in 8 hours

Hi,, i need some help,, before it's to late..

a few weeks back i got a female axi,(i already had 3 males)i put her in the tank with my males,,and half a day later she starts laying eags,, they al hatched and i had to go out and buy some tanks and everything was going really well,, up till today,, i come home from work and most of them are dead, i'm pretty sure it's funges,,(they are like snowflakes)a few of them are still alive ,, some of those are showing the white stuff on the tail,, (its hard to see,, since they are less then 1,50cm,, and just showing some frontlegs)

I cleaned the tank and toke the live ones out and put it in some tankwater from the males,,

Now,,, can i put those little ones in the fridge?? and give them saltbaths??

or will that kill them ?? please help,,so maybe i can save about 20 of them...

(water quality is good,,)

The major reasons for die-offs of larvae are water quality and lack of live food. For a complete list of possible reasons, see:
http://www.caudata.org/cc/articles/why_larvae_die.shtml

Immediately, take out the live ones into a clean container of clean water. Keep changing the survivors to a clean container daily. Keep them cool, but I wouldn't recommend refrigerating them.

thanks,,,i saved about 20 and slowly went down to 14 celcius,, now a day later 4 of them have survived ,, they don't show the "snowflake"on the tails so i put them back in the cleaned tank,,and lets hope they'll survive.