In a properly set up heavily planted tank with a low bioload, water changes aren't necessary. I do water changes in my very heavily planted 15H tank only once every couple of months. Even then its not really necessary. It has a lot of plants, a pretty low bioload, zero ammonia and nitrites, nitrates never get over 10, I haven't lost a single fish other than the little SAE that jumped out of the tank, and everyone is thriving. The key is having a LOT of plants and a small bioload. I did do weekly water changes for the first several months until it was firmly established though.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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