hay everybody,

first i wanted to say thank you for always being helpful and so friendly =o)
ok so i have my new tank that i built and planted and im of course letting it grow in an cycle before anything goes in it but im having a little trouble keeping the heat consistant top to bottom. I E.. the top portion of the tank stays a nice 75-77 degrees F. but the bottom will not budge from 66 or 67. =o( i will post a pic of the viv for more of a visual. this is my first dart tank after years of keeping tree frogs. =o) i was wondering if maybe a heat mat under the tank would help and if so if anyone could suggest a size or brand to best suit my tanks needs. it is a 18x18x24 exo terra.

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