theres 5M/1F gouramis in my 50g bowfront tank. Things have been quite calm for around 9 months, but suddenly the entire surface is covered in fish spit YUCK . I quickly removed it and the males started working together building more and more. Now heres the question there are no two fish alike , will they fertelize a different egg than thier own kind ? I do not want these ones to breed and i cannot understand how the nests stayed together, due to the swirling surfsce water. Ihave alot of current i even turn the filter off to feed them.Oh, remember i had an ich outbreak and since i have raised and maintained the temp to77. Ph 6.8 .