I dont use chaeto anymore but I would trim mine every few weeks. You just want to make sure its growing at a good pace all the time. That means making sure its not completely overgrown in your refugium. I would let mine grow out to almost the width of my refugium and then remove half of it. Im sure there are opinions on this though.
I cant really grow chaeto anymore but red gracilaria thrives in my tank. Let me know if you are ever close by and I can give you a bag of it Randy. It's good for nutrient export and tangs like to eat it.
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