I have a pair of these and would love to breed them. Have done the folloeing actions, water level 6-8 ins, temp 82 F, separated female for a week, fed extrta in that time, plenty of Java fernm in breeding tank, no surface disturbance of water, but in spite of being back together for a aeek there is no sign of activity. Should they be making bubble nest straight away or might it take longer, or could it just be a case of not attracted?