clown fry on just baby brine?

[Reef Puffer]

So my false percs have been laying eggs for a while now and I wanted to raise a couple. I have access to rotifers but havnt been able to make it out to pick them up yet. I figure soon here I will get a culture going and give it a go... But untill then, I pulled a batch of eggs and put then in a tank with baby brine. I water change regularly and add new brine daily as well as add crushed up pellets. Is day four now and there are still at least 50 fish still swimming around that look to be eating. Any body have any experience like this? Any body think any will make it? Anybody with any tips? Im actually surprised that there are still so many looking so good.