rhinod56;643581; said:if 50% is what you normally do on a weekly baisis..its too much...
try a 10-15% water change 1x a week, if not everyother week...
your not giving the good bacteria enough time to establish, and esentially almost starting over everytime. 4months espeically if you've been doing 50% changes has not been enough time to properly cycle/establish the tank...
when doing a change you can add some "prime" or "stablility" made by seachem...should help keep all your levels in check...
when doing water changes, if you do weekly, pick 1 half of the tank to work on. week 1, compeltely overhaul and thouroughly clean the right half. then week 2, don't touch the right half, but do everything to the left half, and keep working back and forth...its worked wonders for both all of my tanks, and most everyone else I know who uses this method
Ummm is there an I Disagree emoticon?
Doing a 50% water change is not going to effect a cylced tank because in a cycled tank, there is not detectable ammonia or nitrite so doing water changes isn't going to affect them. On another thread, we discussed how they can survive without food for a while. Gravel washing 1/2 and 1/2 is for UGFs becuase you don't want to upset the bacteria. With a tank with HOBs, sponges, canisters, or sumps with w/ds gravel washing everything is fine. Also, Prime is just a detoxyifier so it won't do anything for a cycle.