I have a 3 inch powder brown tang that just died in my tank. He is in the back of my rock work and I really don't want to take this" puzzle" apart. My tank is a oceanic 120 with a 30 gallon sump. My protein skimmer is an ETSS 60 sump buddy and so far my water parameters are in line. Tomorrow I am doing a 25 gallon water change which should also help keep the water clean. Do I have anything to worrry about if he slowly decays?