NEPTUNE SYSTEMS APEX FMM OPTICAL LEVEL SENSOR V2 (OS-1) Hanna Instruments RUBY red wall to block

RUBY red wall to block light and prevent unwanted algae growth in skimmer section

If you notice this then we suggest slowly reducing the amount of carbon source added

Many marine aquarists only give the oxygen content in their aquarium water a passing thought

And unlike many wimpy pumps out there

Excess calcium may enhance the loss of carbonate alkalinity

NEPTUNE SYSTEMS APEX FMM OPTICAL LEVEL SENSOR V2 (OS-1) Hanna Instruments RUBY red wall to blockOptical Level Sensor (OS 1) This sensor plugs into your FMM and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO (auto top off), as a high level warning sensor in your sump, water storage level sensor, and much more. The sensors can be mounted into custom brackets or through a hole in a vessel. Included are a fastening nut and