This HOG3xx is a highest power 12-LED version of the original HOG3 which has 6 LEDs, and HOG3x which has 9 LEDs. This HOG3xx also has two power supplies like the HOG3x; one for a low-power 6-LED mode for startup when the growth surfaces are pure white, or for very new aquariums when there are not many nutrients in the water; and the second one to be added-in once growth darkens up the white surfaces.
This HOG3xx, just like the original HOG3 and HOG3x, offers much larger algae-attachment space to hold more growth between cleanings compared to the HOG.5, HOG1 or HOG1x, and is 2-sided instead of 1-sided because of the strings, compared to the HOG1.3 and HOG2 which have no strings. 2-sided allows light to reach further into the growth, and is best for saltwater (freshwater is best with no strings, such as on the HOG2). The strong magnets attach to thick aquarium walls up to 1/2" (13mm) glass or acrylic, which is a bit less than the original HOG3 can attach to because of the extra weight of the LEDs and power supply cords. Thus this HOG3xx is ideal for sumps of larger systems, because sumps rarely have thicknesses larger than 1/2" (13mm).
Compared to the HOG1.3 and HOG2 which look the same in size, the HOG3xx is meant for situations which have severe nutrient or algae problems, even in cases where the rocks in the display are covered in thick green hair algae. Algae-covered rocks are the most difficult situations to fix because the photosynthesis of that algae on the rocks is consuming nutrients from the water (often it measures zero), making it harder for the HOG filter to get the nutrients. To combat this you need stronger photosynthesis in your HOG scrubber, and that is what the HOG3xx is designed for. In particular, compared to the original HOG3 and HOG3xx, the extra extra LEDs of the HOG3xx provide the highest photosynthesis yet in this size scrubber and is suitable for the highest amount of nutrients (such as phosphate) in the water.
The large inside space of the HOG3xx growth compartment allows for lots of build up of algae, but most importantly the 12-LED light provides the strongest photosynthesis of all the HOGs, giving it the best chance of out-competing the scrubber on your rocks and also cutting through the phosphate in the water as high as 1.0 ppm. The 12 LED light grows green algae in situations where the lower power of the original HOG3, and certainly the HOG1.3 and HOG2, would only grow brown algae or slime. So this HOG3xx model is great for aquariums that have been running for years and are showing signs of old tank syndrome, or in highly-fed predator or NPS corals tanks, especially where the water has very high measurable phosphate. Be sure to follow the special instructions on reducing the light during start-up (by using the low-power mode) because the strong light and white surfaces will photo-inhibit initial growth in the scrubber if the light is not reduced.
Comes with 3 ft (90 cm) of silicone airline, but requires an air pump that can pump at least 2.0 liters per minute (.07 cfm), preferably more. A pump that says it can handle 2 or more airstones/outlets, or a pump with 2 tubing attachments instead of one, will be needed. You can have as much air as you like, however; 10 lpm pumps are no problem (although it will be louder).
Comes with 12 red (660 nm) 3-watt LEDs, which are attached to a heat sink inside the cover; the cover does get warm. The LEDs will give the aquarium or sump a slight red color at night when the aquarium lights are off. You will need to get a timer so you can run the LEDs for up to 22 hours per day (not 24). A single timer to handle both power supplies is fine. The LEDs never needs replacing.
The HOG3xx growth compartment will need to be cleaned every 7 to 14 days, by removing the inside cover, disconnecting the airline, and taking the inside cover to the sink so you can brush the algae off of the growth surface and the bubbler with a toothbrush, and also off of the strings. Sometimes though you can just reach in an grab the growth, especially in saltwater. The Green-Grabber growth surface is permanently glued to the inside cover using epoxy, however a few of the Green-Grabber particles may dislodge during the first few cleanings, which is normal. Cleaning the growth surface, bubbler, and the inside cover takes about a minute with a toothbrush.
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