I've seen this with a loose fitting post di. It could be letting air in so what you are seeing is the tube draining, filling, draining, filling, ect ect.
I'd recheck fittings. Post a pic of the unit.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers.
Current Tank:
Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.
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