I am very glad to hear your good experience, – thats mine too, that these larvae are very good when you want to count your fish 🙂 ..also the fry. It brings the fish out.
But I was just thinking, – actually you cant really say that it takes two days, because you dont know when your particular raft was produced, – and how long it had been in the water before you took it 🙂 …
It may have been there for many days really 🙂