Well by in-tank i mean that the filter has suction cups and sticks to the bottom of the tank, i wasn't quite sure about it so i held off on buying it.
Thanks for telling me that they don't need a heater, that just saved me a lot of money, and seeing how i live in Florida it should be that hard to keep the room at a constant temperature, but do i need to avoid direct sunlight?
And one more question, what is a good brand for a filters? I've never used a filter before. Thank you.

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