The SURF4x is the stronger-LED version of the SURF4, a floating surface upflow algae scrubber with Green Grabber surfaces, and strings for saltwater, designed to reduce your glass cleaning and water changes while creating an environment for living micro-animals to grow inside the scrubber.
The SURF4x offers drop-in installation, reduction or elimination of water changes and nuisance algae, along with almost no-light and almost no-sound, and --possibly most important-- one-handed cleaning with no disassembly required. Compared to the SURF4, the SURF4x has 4 extra LEDs, making 12 in total. These Xtra LEDs allow the SURF4x to grow green in water with higher nutrient levels over 0.2 ppm phosphate, where the lower-power SURF4 would grow dark or black instead. In addition to growing green sooner in higher nutrient water, the SURF4x will generally grow more algae overall and at a faster rate (the top layer of floating algae in the scrubber will generally be about 50% thicker than on the SURF4).
Other than the more powerful LED light (which also fits the larger SURF8), the SURF4x is identical to the SURF4-- simply lift up the LED lid and pull the algae out! You can even feed some of the algae to your fish and snails if you want (fresh is best!)
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