Morning Shelagh, my your up awfully early! Glad they all seem fine, see how the tests come out today, if they are fairly low or 0 (fingers crossed) then I would feed them once but only a small amout. Dont worry about it too much, they can survive a good while yet before they get too many rumbles in their tummies 
But you do need a little bit in there to finish off the cycle. Also raising the temp slightly is said to have an effect on bacteria growth as heat makes things speed up. Just put it towards the higher end of what your fish can tolerate...don't bake them though.
Well Done