Eheim 100 Watt Thermocontrol Aquarium Heater Bass & Basslets or gravel vacuuming

or gravel vacuuming

even if it later appears to return toward its original colour

source-water checks

multiple colour settings

Eheim 100 Watt Thermocontrol Aquarium Heater Bass & Basslets or gravel vacuumingEheim 100 Watt Thermocontrol Aquarium Heater Stable Temperature Support for Medium Aquariums The Eheim 100 Watt Thermocontrol Aquarium Heater provides precise adjustable heating for freshwater and marine aquariums where consistent temperature control is essential. Its laboratory glass jacket, watertight submersible design, and accurate thermostat make it a trusted heating option for everyday aquarium use. Eheim 100W Thermocontrol Heater Features 100