Ok I mentioned about my 60l wipe out this tuesday but today while I was changing water (As I was feeding NH3 to keep the bacteries), After suck out 50% of the tank water, I realize there were lots of fries!!! I immediately add the water with the same ph/hardness and temp. There are also 5 red cherry shrimp in the tank cause I just bought them and no where to home them!

What should I do now?!? I have no idea they left me a horde of their kind after dying. There're more than 10 fries left now in the tank. I haven't started infusoria culture

If you can't get manufactured fry food a good stand by for egg laying fry for the first few days is hard boiled egg yolk. Wait until the fry are free swimming and then start feeding:

Take just the yolk of a hard boiled egg, put a small pinch into a clean cotton cloth (e.g. a handkerchief), and squeexe the egg yolk through the cloth into the water. This will make a "cloud" of food for them. Do this several times a day for a few days and then move them onto finely powdered flake food or live baby brine shrimp as they grow. Be careful not to feed too much and do daily aprtial water changes to keep the water free form ammonia and nitrites.

My Danios did this to me a couple of years ago - I bought six and when I moved them from the quarantine tank I turned off the filter, heater etc but didn't empty the tank right away. When I went to empty it a few days later I found 50-60 fry in there.

Are they ok with red cherry shrimp? Damn the danios, I hate surprise like this

They're free swimmer now but there're only duck egg left, I'm gonna buy some chicken egg tomorrow. Should I do it now to feed them? (I think they're free swimmer now cause' they stay together in pack and sim away from me...I thought they were some kind of worm and tried to syphoned them out then realized no way worms swim like that)

They should be OK if they're swimming. You can use a duck egg instead of a hen's egg if you want

So should I feed them now? I have no idea if they're hungry or not...

btw, the water temp is 28C, which is high for danio but they're fries and very sensitive to water and they've been living under that condition for like 5 days or more. Should I add ice pack to reduce temp or leave it be?

If they're swimming (proper swiming not just scooting along the bottom)and their yolk sacs are gone then they're hungry. Fry are always hungry so have to be fed several times a day. That's why the daily water changes are vital as left over food contaminates the water.

I would not add an ice pack as fluctuating temperatures will be more harmful than having it a bit too warm at the moment.

Thanks, yes they're actually swimming on the surface,around the tank and they manage to get away from sponge filter. ( I believe they're hatched like 3 or 4 days )
So how do I syphon to do water change the water out without sucking them out too? how many percent of water should be change?

You just have to be very careful - if you put the syphon right down to the bottom and watch closely you should be ok. Using airline as a syphon can help reduce the risk, but it's a tricky process and just needs care and patience. Change 25% at least daily. Check the bucket afterwards for any that accidentally went through the syphon and put them back in the tank.

Just fed them, no idea if they're eating or not

I realized that there are some bigger and some smaller, the smaller ones are almost invisible!

If they're like mine were, they'll learn very quickly that the "cloud" is food and go straight for it. Soon after that they'll be rushing to the front of the tank when you approach as they'll recognise you and associate your presence with feeding