The HOG2 is a hang-on-glass algae scrubbing filtration system that can be used to reduce your glass cleaning and water changes while creating an environment for living micro-animals to grow inside the scrubber.
The HOG2 is the larger version of the standard HOG1 and HOG1x algae scrubbers. The HOG2 offers 4 LEDs and a much larger algae-attachment space to hold more growth between cleanings, and also stronger magnets to attach to thicker aquarium walls up to 5/8" (16mm) glass or acrylic. If your tank is larger than a nano, then you should consider this model or larger.
The HOG2 is ideal for tanks which have some nutrient or algae problems, but the rocks in the display are not yet fully covered in thick green hair algae. The HOG2 model is great for aquariums that have been running for a year or more and the display rocks have already filled with phosphate, and are thus starting to show algae on them. However, if the display is full of green hair algae and thus the nutrients measure zero in the water (because the algae on the rocks is absorbing them), then the stronger photosynthesis of the HOG3 would be better than this HOG2, so as to be able to out-compete with the photosynthesis on the rocks.
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