Hydor Theo Aquarium Heater 25W 18cm (25L) Salts & Supplements It works better at alkaline

It works better at alkaline or neutral pH

Features an alarm function to alert you if the temperature falls or increases beyond the set temperature range (between 1-5 degrees)

Fluval ClearMax is a science grade resin designed to adsorb phosphate

High content of Spirulina and Krill extracts with other colour enhancing elements to improve colour within 2 weeks

Custom fit for FX Series filters to increase filtration efficiency

Hydor Theo Aquarium Heater 25W 18cm (25L) Salts & Supplements It works better at alkalineThe Hydor Theo heater has all the essential features for the precise and safe maintenance of the water temperature in your aquarium. The exclusive technology used and the high quality of the components guarantee a long life. Ideal also for turtle tanks, the heater is submersible, anti thermal shock, highly resistant and features a graduated scale for precise temperature regulation. It can be positioned horizontally or vertically. Internal heater for