ok green terrors need at least a 55 for a small pair males reach maturity at around 4 inches and females are much smaller rounder rounded fins darker geen with brown and almost grey throughout the body the best water and settin g you can provide is a soil bottom with some amazon sword plants some type of floating plants to break the light up moderate structure driftwood is perfect stack the wood intricatly.... soft water is bed fill your canistor with a little peat moss and do water changes with ro water sold at most lfs feed lots of algea spirulina flake and feed live feeders twice a month followed by a heavy water change to spark a spawn also use a low light bulb such as a plant bulb dont use the high spektrums