ok so this may be a dumb question but here goes. how essential are the essential trace elements in our tanks? I have not been adding them to mine (however it is still fairly new approx. 6 months) but just curious as to how many of you do and how much are they really needed.?.? If you don't do you just let it ride with regular water changes? I have been testing the chemistry regualrly however many of these elements are not tested for...