To restore the colors of your LR
don't clean it. You want to get the coralline algae to grow and encourage the various sponges, tube worms, and corals to grow again. You may not have adequate lighting or are not supplying the nutrients the corals/sponges/worms/etc need to thrive. Excessive diatom or other nuisance alga are caused by nutrient overload (overfeeding, nitrate, phosphate, etc). Are you using RO
water? Using homemade food is a good way to know what you are putting in your tank. darb2 has given you good advice to add to the clean up crew - snails to eat the algae.