You could try a CHE on a pole and raise it higher than normal over the top of the tank. That picture looks a little larger than 6x4 but if it is a space heater, even a small one would easily overpower the space.
The image below is what I am talking about. You would be surprised how efficient these can be in such a small space. I would still buy one of those lamp dimmer switches to keep it under control.
This is the type of dimmer I mean. You can find them at home improvement stores.
https://www.amazon.com/gp/product/B0000BYEF6
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