so this has been going on about a week now, both my oscars(4 and 5 years old) have been digging this hole in my gravel and hanging around the hole. they run off my blood parrot any time he gets anywhere near their hole. just wondered if this might be a nest? they stay very close to each other for the most part, but i have never dealt with any breedings so i dont know what to watch for, like will one show signs of being with eggs? or are they simply just bored and tearing the tank up? wouldnt be the first time! they have been living together 4 years now, is there a sexual maturity age for oscars? if they were male and female would they have bred by now? i know its pretty much impossible to sex them so any advice/input would be appreciated.