The Apex is known for it’s modular expandability. The possibilities are endless. But nothing works without a module! The modules form the base to every extention you want to apply to your Apex. Whether you want to extend your Apex with a salinity monitor, anti-leak monitor or want to monitor other value’s, it all starts with the correct module. Within this category, you will find all of Apex’ modules. Absolutely the best way to manage your aquarium.