Okay - take the exact time you put them in together, if it was an instant spawn and it does happen, believe me, add 25 hours which would be the minimum time for a hatch if the room is warm as well as the tank. You would need several hours (like about 20-24) for them to start to swim by themselves. I don't believe that the father fighter would be ignoring them if they were his fry. I am also sure that you would have seen him tending to the nest and eggs at some stage as he needs to keep them clean in order to stop any fungus happening.
I don't think that what you see are fighter fry, at least not from this lot and if the water did really get cold - as opposed to get really cold - then they wouldn't be from an earlier lot.
I have just put another pair of mine together and will try and document their progress for you to look at. At the moment she is very stroppy and keeps flying at him but she is a real tart at the best of times anyway :lol: