I suspect my diamond goby may have internal parasites, so I started feeding metro/focus medicated food. I mix the food according to directions, 1tbsp frozen food 1 scoop metroplex 1 scoop focus, then freeze into cubes. Soon after I noticed my ORP is plummeting. I never really paid much attention to ORP, but I have the probe and it’s been pretty stable. Could this be an indication my biofilter is being impacted? Tank seems fine otherwise, any cause for concern?