For growing arowana?? How much par do they need? They seem like low light fish?? Hah.. you must mean something to bring out all the beauty and splendor?? I have a finnex something?? It's like the monster ray. Newer though.. name escapes me. On my discus tank. Makes them pop! One literally got to close and exploded!! It was sad and awesome at the same time. The finnex 24/7 may be a good fit. You can tune the color to any style youd like. Cheap option would be a stingray. Red,blues and whites.