Following a fertiliser explosion at Highlands Farm on 24 July 2026, Coral Passion has stopped trading from the site. Our insurance claim with MSIG Europe is still ongoing, but despite our efforts it does not look promising, and the future of the business is uncertain. Thank you to everyone who has supported us. I am still available & working on aquarium installations and maintenance. For more information, please contact tony@coralpassion.co.uk.


TMC Optical Auto Top Up
TMC Optical Auto Top Up
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TMC Optical Auto Top Up

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£68.99
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£68.99
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High Quality infrared optical sensor with three detection points allows for accurate monitoring of the aquarium or sump water level. This will allow for easy replenishment of evaporated water. Simple installation using compact magnet-mount

Simple and easy to install connect the pump to the tubing provided and clamp it to the edge of the aquarum placing the other end in the tank. using the magnets place the optical sensor a the desired depth. 3 LEDs help to indicate where the water level is.

Include anti-siphon valve designed to stop water flowing back in the reservoir

Suitable for all aquaria

Included in the box:

  • Optical Auto Top Up Sensor
  • DC pump
  • 2m of 6/9mm flexible top up hosing
  • Anti-siphon valve
  • Hose securing clamp
  • PSU and instructions

Sensor Dim. 25x25diam. X 35mm

Pump Dim. 45x28diam. X 38mm