Im only trying it this way because Im new to this and want to see how things work. Its a learning process for me. As to my understanding once the tank has cycled, even with the prawns, it will have enough established bacteria to cope with the load of new fish, if added slowly.
I only ever had 2 baby goldfish in my tank and they both died of ammonia poisoning, and I tried my hardest to reduce the ammonia levels, and even though they weren't very high, the fish became aggitated. Maybe it's because my tank is small.. I dont know!
I am going to continue with this method, and if it doesnt work, so be it, at least I have learnt from it. I am also going to continue recording my results daily so that I have a record, and anyone else who is interested in this method will be able to see the results. I think it's a good learning experience for anyone, even if you're strongly opposed to the idea.
And also fish aren't that cheap to buy you know!.. well at my local shop they aint!