Well, they need good water quality like you have probably read in the article. But I would also be afraid, that all the other fish you have in there are going to eat the eggs. GBRs are not very caring parents. Mine only come back every now and then to fan the eggs, but don't change shifts to really protect the eggs nonstop.
Sometime I'm going to try and set up a breeding tank for them, because even my little endlers were eating their eggs
Previously: 2x 10gal tank, 45gal aquascaped, 70gal aquascaped
Currently: 16gal FW, 40W CF, ADA Aquasoil Amazonia II/Tahitan Moon Sand, PH 6.5, kH2, gH 4