So I’ve had a 75 gallon tank set up and running for two years. Had no fish, live rock, sump and one mushroom coral. Wasn’t doing much with the tank just had it there was so busy with work and other things. Freed up some time getting back to the tank did a 25% water change added Fiji mud to the sump in the bottom added some fish and have had an outbreak of algae. I can’t tell if it’s Dino or Diatoms. Looks like rust all over the rocks and sand I can fluff the sand but within 2 to 3 days it’s back as the rocks I’ve tried to brush them with a brush and the color does not come off. Any thoughts or solutions or comments?
