i test my phos and ammonia and phosphate came some where around .75-1.0 and ammonia like around .15ppm? I used salifert kit and phosphate was really low a week ago but it skyrocket over a week. Im also getting nitrate around 1-2. im not sure whats wrong with the system. i currently have red sea 250 with 5 gallon refugium and 9 small fish. Should i do half water change to lower ammonia and phsopshate? The funny thing is my corals are doing good except digitata(its only half way open).