Your Choice Aquatics Magnet Probe Holder itemID-1345 sometimes over night

sometimes over night

and once placed you may move the modules as you wish about the tank

For these reasons

Composed of purified water and ultra-high purity ingredients

Add 5 ml (1 capful) of product per 20 US-gallons of aquarium water every other day or as needed to maintain the magnesium concentration within a range of 1

Your Choice Aquatics Magnet Probe Holder itemID-1345 sometimes over nightProbe holder can fit up to four probes. Its design to hold ph, ORP, salinity and or temp probe. It has a magnet on the back and can be easily install on the sump wall, baffle divider or aquarium wall. Magnetic can work up to 3 4 thick acrylic or glass.