Rs Electrical Rs- 150 Watts Automatic Glass Heater With Auto On Off Facility With Standby Light Indicator at Rs 299.00 | Aquarium Heater | ID: 2849668228112
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T300 Fully Electronic Aquarium Heater, 300W, up to 80 US Gal / 300 L - Fluval Aquatics UK
What do the red and yellow lights on the Aquarium Co-Op heater mean?