I started a 55 gl. Saltwater aquarium/reef in September, I got the advised of my local store to start it, I had a Powder Brown Tang, 5 Chromies, 2 Clowns a yellow tang, 2 crabs, 2 red shrimps, several stars and others. I said had because I found all dead today, it all started with the Powder Brown Tang, he got ich. I replaced about 50% of the water check evertyhing and was perfect, I checked this morning again an the sam. Fish were not eating normally, I thought stressed for what happened to Powder Brown...
it looks theres something else, found my tank covered in white powder like, water is like if the sand was moved and is all over the water, glass is covered w/white film, corals are getting black...any recommendation?