Update: WARNING! The heater is still working great after a few months but (as later reviewers have pointed out the design of the heater is very imperfect and I caught my fish trying to get into the heater through the side holes. I wanted because of that not wasting a great heater so i put it in a media bag and put it in my aquarium it still heats my aquarium and my fish cant get in I got myself a small 1 watt BOEESPAT aquarium heater as a "shot in the blue". Bought the 50W as it is an unknown brand.Fully adjustable heaters for very small aquariums are hard to find and this one also has a digital display which is a great feature too.Not knowing the manufacturer I wanted my fish didn't risk it so I installed a heater in an empty 3.5 gallon hospital aquarium to test it and I'm enjoying it prepared! I placed three different thermometers in the tank: a digital one next to the heater - on the back of the tank, a glass thermometer on the front of the tank, and a sticker in the corner. After a few hours of heating, all thermometers showed roughly the same temperature (and in different places in the tank, which is often not the case with small heaters). The temperature has not changed for 5 days (I have that much). I have NO issues with suction cups. Once I placed them correctly, they stayed in place. I set the temp a lot higher (90F) and touched all the outer parts of the heater and none of them felt hot so I'd say the fish is able to swim. (besides lounging, as we know, there are plenty of fish that like to nap right next to the heaters). Overall, I'm impressed with this first week of use. Now let's move on to testing strength and durability. The time will show!
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