HOG3x for higher nutrient water, $399 new

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The HOG3x is the smaller version of the 2-power supply HOG scrubbers (HOG3x, HOG3xx) which is a good choice for medium nutrient water (P under 0.3 ppm). HOG's are great for growing slime, which is what starts growing first in water like this.

https://www.santa-monica.cc/HOG3x-H...-Xtra-LEDs--3-cubes-feeding-per-day_p_65.html