I'm a she, name's Lindsey!!!
I check the water parameters regularly, everything is always spot-on!
I change the filter media as per manufacturers instructions.
I also test the nitrate levels regularly and carry out 25% water changes every fortnight, although according to my test results the nitrate levels are still extremely low then.
The tanks been like that for over a year and I very, very, very rarely get any disease or illness. Off the top of my head I can only think of one outbreak of ich and that was probably about 6-8 months ago. My fish are all very happy and active!!!
Thanks for your comments about my tank though - I was going for the natural look.