HI.. bit new to this !... and to corys..really love them and have four bronze.. 2male 2 female ..(I think !)... have a 4 ft planted tank , now 7 mths old .. small gravel substrate, plenty shade and bogwood.. temp 24 , ph 6.5-7.0, ammonia nitrate and nitrite ok.. phosphate gets to 2.0 after a week ...