When do you know it's time to trim back your macroalgae in your refugium? How full do you let it get? Packed to the walls? Some room so that it's free flowing? The more the better in the refugium?
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Can you post some pictures? ~Shaun K.
flow is key, so if it gets flow through and it doesn't become filter floss for gunk, you are ok once it traps stuff it def needs trim