grimlock3000
Aquarium Advice Addict
Two Oscars in a 55g is pretty much fully stocked already (and some would say overstocked). The two large ones you have already are still growing and will want more room soon. Four Oscars in a 55g is simply not going to work IMO regardless of how you introduce the new fish. The fish will be too large...
Maybe we can work out a different solution, which tanks are these fish in:
6 lemon tetras
3 pearl gouramis
2 blue gouramis
2 white gouramis
1 opaline gourami
1 pleco (the Beast)
zillions of guppy fry
-In the 55
1 albino red oscar
1 tiger oscar
-In bowls
3 male bettas in planted bowls
Maybe we can work out a different solution, which tanks are these fish in:
6 lemon tetras
3 pearl gouramis
2 blue gouramis
2 white gouramis
1 opaline gourami
1 pleco (the Beast)
zillions of guppy fry
-In the 55
1 albino red oscar
1 tiger oscar
-In bowls
3 male bettas in planted bowls