Russ,USA,illinois
thanks bianca .
most of that is from research on this site and a few others .the rest is from what i have seen .
I never really took notes or anything untill latly ,so my O's may of shoveled gravel longer also .But i do think it is a good sign that they may lay eggs.
one thing that i might have done differant than you is . whenever i clean the tank or move anything around i always scoop thier hole back out . they always dig it in the same spot so i just go ahead and do it for them .I try to make sure there is some gravel on the rock/slate , this way they can still do the cleaning process .As long as my oscars have thier hole dug ,they dont seem to mess with it anymore . maybe they just take a scoop here and there if some falls in .