Heaters are essential for creating the correct environment within your aquarium for tropical fish, most fish are cold-blooded which means they have to rely on their surroundings to regulate their heat. This is why it is recommended that you purchase a high-quality heater and a thermometer so you can cross-check the temperature that the heater is set too. Here at Lincs Aquatics we offer a wide range of heaters from trusted brands like Fluval, Juwel, JBL, schego and Aqua One.