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Capn, nice looking bunch of seaweed you have there.
As to ulva, I get about 50 lbs. of it on my boat prop every time I anchor in shallow water.
That is the single best way to keep hair algae out of your tank and keep everything healthy. Almost any type of seaweed will reduce nutrients and there is some studys that suggest algae adds some important nutrients to your water while removing unwanted chemicals.
I myself don't have a refugium or sump but not because I don't want one. I do have an algae tray where all the water from my skimmer passes. If I had the time and room I would have a lighted refugium as large as possable.
Paul
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I used to get shocked when I put my hand in my tank. Then the electric eel went dead.
Current Tank Info: 100 gal reef set up in 1971
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