Why are there so many negative reviews about this heater? Thank goodness it's an old-fashioned aquarium heater with a knob on top that mounts with its head on the water's surface. Yes hello the residue should be in the water it heats. It works, without all the fluff and pointless annoying new crap Gee! Can't wait to electrocute you with a lamp cord going into the water, newer pre-voiced shit. Yes, you should keep the water level in the aquarium up, but what hobbyist would allow the water to evaporate more than an inch from the top? It's cheap and works like an aquarium heater. If you're a fool who thinks it was made to heat a half-filled turtle or newt tank and you foolishly built the mount to be completely submerged, don't blame the heater for yours problems. absence of gray matter. It is what it is. The thermostat works, but if you're the sort of neurotic who decides your tank water should be kept at 75 and a quarter degrees without hesitation, or if you honestly think you should turn this thing on, watch the heaters move turn. red and then stick it in your aquarium without breaking the glass and then ask your psychiatrist which aquarium heater to buy, this one is probably not for you.
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