I have a 50 gal
salt, 4-6" sand base, two clowns, two damsels, coral beauty, small clean up crew. It has a custom filter and protein skimmer, perfect water when I test. I use Calligan water for additions and changes.
My tank is beautiful, EXCEPT, it always has a rust colored coating on the top of the sand. I try to reduce the lighting, (std lighting) and keep the blinds down. I thought it was the lighting, but nothing seems to help. It just "looks" brown and rusty on the top of the sand. I WOULD LOVE any suggestions on this. I want the white clean sand. My tank is over a year old and the fish have done excellent. My clown fish breed and I have siphoned off and raise clark clowns. Most everything is great, except that my sand look horrible.
HELP. I have asked this question before on another board, but no one has ever responded with an answer.