11-29-2007, 12:27 PM
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The carbon might help for a week but won't get your levels down enough to make them safe.
First thing, do a 50% water change as soon as possible. This will theoretically reduce your levels by 50%.
When you say that GH and KH are off the chart, is that from a liquid regeant test kit or test strips? Also, are the toher results form test strips? If they are, then you could very well be getting very poor readings and very inaccurate. For now, if money is a problem, the ammonia and nitrite tests are the first ones you need, then nitrates then GH and KH.
Also, test your tap water and see what the levels are after it sets out for 24 hours.
You said you added the old filter, was it an immediate move or did it go dry any lenght of time? As for getting a larger one, it is up to you. It is hard to overfilter, though very possible, and a 100 gallon rated filter won't hurt anything. Just make sure to move the biochem stars, the ceramic rings and anything else you can into the new filter without letting them dry out or sit for more than an hour or so during the change over.
Don't give up, it can be frustrating to have problems with new tanks but so rewarding once the problems are gone and you can enjoy your fish.