They're not only good, they're necessary to keep the water clean. Once you do have a cycle established, it's pretty much a rule of thumb to do weekly changes/water tests to keep the cycle going and your fish healthy.Originally Posted by SCWood
Without water changes, the ammonia and nitrites/nitrates would build up to very dangerous levels. It's actually the most common killer of fish (especially for those fish wrongly kept in vases and bowls).
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