Well the tank is a 27 gal hex, no plants, 10-12 hours of flourescent light, ammonia 0, nitrities 0, nitrates ?. There is some diffuse light in the middle of the day. The tank contains two yo-yo loaches, a rubber lip pleco, six neons, and four corys of different species who were rescued from and ungreatful ciclid that I rescued as a 1/4 infant in an unmarked tank at the local petsmart.