That sounds like a good idea. Make really big water changes until the ammonia and nitrite are cycled out of your system. Your nitrates are low (I think this is what you mean when you say 10 or 20, not nitrite), which means you've been doing plenty of water changes, but something's messed up your biological filtration, which is why the ammonia and nitrite are present at all. So, try and figure out what that is -- overfeeding, over-cleaning your filter media, especially with tap water, possibly some type of medication, etc. That way, once you get back on track, you'll stay on track. Good luck!