Hello there as a old school reefer dinos are a new thing for me back in the days we never had to worry about. I’am here to offer you some advice. 1 raise your temp to 79 and keep it there. 2 stop using any chemicals do the natural approach. Do a black out for 3 or 4 days. do your 20 to 25 percent water change ever week the only thing I use for filter media is carbon and phosphate remover.