I need some expert advice .tank is an 8gal nano cube all peramiters were great went to lfs got rodi did water change of 1gal like I do every week I checked the salinity b4 and after was no change within hours all my mini misleged stars were dead and my charab angel is floting at the top.still breathing but lost most its color. Sexy shrimp,vitals,and anthia look as if nothing is wrong... What should I check in the water I did not use to see if it was spiked? Any ideas what happened? Tank has been up for a yr now with original inhabidance I can't check perams till morning but salt where its been for yr oh yea and no temp swing or oh swing. I think it was th rodi water but no clue how