read somewhere that you shouldn't until the tank is fully cycled[/QUOTE]
I was told by a petsmart employee not to do a pwc
for 3 weeks(during cycling) and just do it once every week after. Oh boy was he so wrong. My nitrite level was so high. So I posted a thread here about it and was told to do a 50%pwc
a day or if not twice. I did what they told me and now my fishes are really happy. Nitrites are down to .25ppm and looks like I'm almost done with the cycling. I will do another 50%pwc
tomorrow. You can check the thread that I posted. You'll learn a lot about what to do while cycling your tank.