What the heck! Been battling this for months. Finally pulled all of my rock 2 weeks ago and scrubbed with a toothbrush. Looked great for a week. Stepped up to 30% WC every 2 weeks and 15% on opposing weeks. Running recommended dosages of purigen, chemipure, phosguard and carbon. Skimmer running and cleaning foam filter every few days. Running in tank media tower and fuge basket in a 29 gal biocube. Cube has rapid led lights running 9am-8 pm blues and 10am-6pm whites on about 30% power if not less. Sand sifting sea star, serpent sea star and various CUC. And a very lazy lawnmower blenny. Feeding flake food to 2 clowns and lawnmower lightly every day- every other day.
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