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Originally Posted by Simpte
Your ammonia and nitrites are at leathal levels already. Small waterchanges daily or every other day should help until the cycle completes. Don't vacuum the gravel everytime though.
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With those sort of levels, I would be going for really big water changes, like 2/3 of your water daily. What good are 10% water changes going to do when your ammonia levels are 5ppm? a 10% water change will bring it down to 4.5ppm, which is very little different. Even a 25% change will only bring it down to 3.75ppm, which is still wayyyyy too high. A 2/3 (66%) water change will bring it down to 1.7ppm, which is still bad, but much better than 5ppm!
Of course, you must make sure you use water conditioner to get rid of chlorine, and make sure the temp is matched, and it's best to let the water sit overnight to get rid of some of the dissolved gasses, but with these caveats, such big water changes won't be bad for the fish. I fact I think it's the only way to give the fish any real chance at living.