FWIW, when I feed my tangs I turn the powerheads off but leave the return on. The return alone gives quite a bit of flow so it gets them pretty active to catch the food. I feed LRS Heebivore frenzy supplemented with selcon and garlic (selcon every day and garlic every other day) as well as offer a full sheet of fresh nori 3 days a week (which lasts all of 10 mins)
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