<a href=showthread.php?s=&postid=13340539#post13340539 target=_blank>Originally posted</a> by gordon2726
Very nice Seng, did you find out why it crashed?
I have installed a big RO/DI unit on last year and every time water change will cause a lot RTN problem to my sps . Before that I have change 50% water monthly with tap water without any problem but started with RO/DI 20% water change already causing a lot RTN problem . I'm not realize the problem are due to RO/DI and doing more water change after RTN happened but the situation become more worst . Finally I try again water change 50% with the tap water and RTN stopped ... but nearly 80% sps are died so I re-start and rescape the tank again . I have run the RO/DI unit for 48 hrs after the crashed and started to use back the water for WC without any problem now . I'm not really sure what happen to the RO/DI unit but just suspected the carbon or others are too new and need to wash out those chemical etc just my opinion only I'm not good in chemistry ...