i have been having ammonia troubles in my display tank. on my api test it registers .25ppm corals seem to be ok my gonipora is fully extended along with zoa's my hammer and frogspawn isnt opening up. my paramiters is within range my alk is 9dkh , cal. is 420 , 0 nitrates , ph. is 8.1. I tested my ro water for ammonia and i have no trace . i mix my salt up with it and im getting .25ppm- .5ppm . I had also ordered new ro/di filters along with my ro membrane. i've started to get a 7ppm on my tds meter. Any help in this area would be appreciated.