Refugium growth halt?

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Madonia

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I’m fairly new to refugiums. Have had one set up on my Waterbox 130.4 since inception 9 months ago.

Nutrients got very high at one point (was fighting dinos)- phosphate 0.25, nitrate 20-25. Chaeto was growing great.

Now my nutrients are lower- phosphate 0.03-0.1, nitrate 10-15. Chaeto is receding big time.

Wondering if this is normal? Does chaeto growth wax and wane with nutrient levels?

Anything I can do to promote its growth again without affecting chemistry too much in my tank? Things are finally stable.

I’m using the reefbreeders refugium light.

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