Blue Opaline GouramiThe popular Blue Opaline, also known as Blue Marble Gourami, is an easy and peaceful to keep species which makes an excellent tank mate that is suited with other similarly tempered fish. Some adult males can show territorial behavior against newly introduced gourami tank mates. Easy to feed, readily accepts all dry food and frozen foods. Fish Size Guide: The 'Maximum Size' outlined below is the length this fish can reach as a full grown adult. For the