i need quick answer
 

ok say u take 20 percent out fish tank u put 20 percent back but u dont have anything to take out chlorine cuz u ran out and didnt rememeber to get more will fish live or do u need to get go get more or will they be fine seeing u only took 20 percent the water out

depends how much chlorine is in your water and how the fish will want to react. if you run a red light will someone hit your or will you make it?

i make it lol

I would NEVER chance something like that. It's safer to put off the pwc for a day or two than risk the chance off killing your fish.

yea i just found an a bottle in the back wooohooooo has some in it to finish the job then throwing that one away

you can also leave water to sit out for a couple of days and the chlorine will dissipate, if temp isn't an issue.

That's not completely true. Chlorine will dissipate, yes, but chloramine doesn't dissipate so easily. Neither do heavy metals or things like ammonia. I'd stick with the water conditioner.

+1 batman

true...and all the ammonia (tons) in my tap water wouldn't dissipate either : |

My water doesn't have chlorine in it:-).

I know with hardy fish small waterchanges like 10% don't cause a problem because the tank will dilute it.

Other than that, stick with the conditioner. Putting of a WC a day or a couple usually does no harm.