They'll find it. They are smart little things. Also, if you have live plants, they'll eat the organisms off those too.
As for the cycling suggestion before....that won't cycle your tank. It may give you a tiny kickstart, but your tank would certainly not be fully cycled and you'd still have the risks and stress on the fish.
As for the cycling suggestion before....that won't cycle your tank. It may give you a tiny kickstart, but your tank would certainly not be fully cycled and you'd still have the risks and stress on the fish.