It started as what looks like stretch marks. Have checked all water parameter; kh, cacium, phosphate, nitrates, nitrites, amonia, ph, salinity all are in tolerance and right in line with previous tests. Aquarium is about 2 years old 60 gal with 30 gal sump running a fluval 406 and a corallife protein skimmer in sump with circulation pumps. Please Help can't find anyone who knows what it is see attached photos.





