nest-box problem and what to do

[micko and jack]

the birds are all fantails my nest-box problem I have 8 boxes all the same construction 2 pair are on chicks after reading up a bit I put a second nesting bowl into their boxes 1 pair is ok with it and building a nest the other pair are trying out other nest-boxes and chased a pair about to lay out of their box I got the 2 birds and locked them in their box with their chicks second nest-bowl water and feed with some grit mixed threw it and intend to keep them there until the other pair lay am I doing the right thing thanks micko