02-01-2008, 05:42 PM
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Yes, you should be doing partial, weekly water changes. About 15-25% of the water would be ideal. The filter can't keep the same water clean forever, so it would be really beneficial to your fish if you changed some of the water every week. With the changes, some of your water parameters will change. If you have any ammonia or nitrites in the water, partial water changes will be beneficial, because you don't want these. The level will go down with each change. But until you find a test kit we can't know. Go ahead and do a partial water change, but remember to add something to remove the chlorine first if you use tap water, otherwise your fish will be harmed.
And I know those test kits are expensive. If you can manage it, get the API master liquid test kit. My local petco sells them for $30, but if you can look around online you might be able to get something cheaper. I got mine for $15 on eBay, which included the shipping costs.
Good luck to you.