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Reverse Osmosis and Deionization systemMollyfish said:What is RODI
40ppm certainly won't do your fish any favors and theoretically may shorten their lifespan but it's not exorbitantly high and if maintained at that level isn't going to cause dramatic illness or stress to most commonly available fish so I wouldn't get too excited over it. keep up on your maintenance and monitoring and overall it's not a terrible level just where many keepers ideally max out and perform water changes. Some people aim for lower numbers and some even a bit higher (though higher would personally make me uncomfortable for any period of time).Mollyfish said:The fish seem happy so would 40 nitrate be ok as long it does not go above?
Hello Mol...Mollyfish said: