Originally Posted by rexpepper651
so ive been dealing with bba an i got some new ideas for dealing with it that im going to give a shot. ive been reading that on low tech tanks only topping off the evap is all that is needed? so everything ive learned about doing weekly water changes is bs? im not sure about this.
Please keep in mind where the tank winds up with water changes. Assuming something measured in linear units in increasing at a constant rate, where does the tank wind up?
In order for that to happen the amount of build up you experience would have to be removed by the water changes.
Just before water change value=(buildup between water changes)/(fraction of water changes)
for instance assume you are building up an 1per day and changing 10% of the water every 10 days:
just before water changes=(1ppm/day*10day)/(1/10)=10/.1=100.
So a 10% water change winds up at 10 times the build up between changes.
1/5 water change 5 times, 5% 20 times and so on.
So to me is much more important to reduce or eliminate the buildup between changes. When that is done the water changes have no effect and in fact can degrade the system.