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To address the issue of it opening up, I'm not so sure I'd focus on feeding. Toadstools need enough flow to be able to shed their mucus membrane every so often. If that's not an issue I'd do some testing as they have very modest light requirements and this is not likely an issue. These corals do well with no supplemental feeding, and if it's not open, it's not going to be eating what you're putting in the water. How long has is been closed?