FMM Module light They have a 3/4″ crown

They have a 3/4″ crown with a 7/16″ base and fit perfectly into standard eggcrate or into small cracks or crevices in live rock

Safe™ may be used during tank cycling to alleviate ammonia/nitrite toxicity

Safe with fish

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Patent Pending)

FMM Module light They have a 3/4″ crownMIX AND MATCH SENSORS AND ACCESSORIES TO GET JUST THE FUNCTIONS YOU NEED The FMM has four ports where you can plug in various sensors and accessories (all sold separately). The best part is that they do not need to all be of the same type. This means if you want to have a flow sensor in ports 1 and 2 and then a leak detection probe in ports 3 and 4 NO PROBLEM! Want a flow sensor for your return pump, an optical sensor for emergency sump level