So, due to the recent death of my two gerbils (may they rest in peace) I now have a glass aquarium to use. Since I breed guppies for fun, I decided to make it into a guppy grow out tank.
I do have a heater (it's adjustable) that is recommended for tanks 'up to 15 gallons'. I haven't put it in there yet due to the fact that for some odd reason it didn't come with suction cups and I haven't had a chance to get some.
My question is, would it be safe for me to use the heater while simply laying it on the gravel? Or should I attempt to wedge it underneath the lid? At the moment I have been using a heat lamp that I used to use for my hermit crabs (the tank has a mesh lid) it seems to be working okay, but I don't feel safe leaving it on constantly as it gets really hot, and I get worried about what the temperature fluctuations could do to the guppy fry. Any help would be much appreciated :)
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