[scott3569]

This is a very interesting thread for me..I am quit new, and have been doing a lot of research..

As for the very last question, I would understand it, as No you are not pulling out and beneficial organisms when you do a water change, and if so, it would be very minimal..most of your beneficial organisms are in your rock, and your sand bed, and as you have it the cheato......

I say this because my way of thinking is, if you did pull out that many beneficial organisms, than things could not thrive..and quite obviously they in fact do..they thrive even when a 50% or large water change is done..

I may very well be way off, but thats my 2c