I have had this Duncan in my tank for the last 2 months with no problems and then 2 days ago I did a 10% WC however changed from Instant Ocean to Reef Crystals, now my Duncan has been closed ever since and it's got me worried. All my parameters are in order and I use RO/DI as well so any ideas on what may have happened? Is it a lost cause or just a temporary thing it's going through?
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