I have a bunch of water hyacinths in one of my sumps. They do a good job of lowering my nitrates and keeping them in check. But water changes are still important, nitrates are not the only reason for water changes. Chemicals, organic waste, and other things build up in the water and can only be removed by routine water changes. The addition of new fresh water also replenishes trace elements that are vital for a healthy aquatic ecosystem. I wish I could say there was a plant that could do it all but IMO water changes are still important.
Sent from my iPhone using MonsterAquariaNetwork app