I turn the main powerheads off but one and the return remains on.
The Dendros are basically open 20 or so hours of the day no training required. They occasionally close but spend most of the daytime open. I remember bringing them home within 5 minutes of being put in the bag they opened up and I knew they were going to be good. Have had a few babies since. The black suncoral stays closed much of the day but it does open for a few hours during the day. It took them a few weeks to settle in. Often I do feed them during daylight hours just to encourage them to stay open.
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