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There's something about mixing electricity and water that just doesn't sit well in my mind.
I also doubt that you'd get enough energy out of it to see much of a difference. For a 150g aquarium, you aren't going to have more than 450W of lighting. Assume that of the 450 watts, 20% is lost at the ballast as recoverable heat. That only amounts to 90 watts, which isn't enough to heat much more than a 20 or 29g aquarium. The minimal benefit won't justify the risk IMO.
I also doubt that you'd get enough energy out of it to see much of a difference. For a 150g aquarium, you aren't going to have more than 450W of lighting. Assume that of the 450 watts, 20% is lost at the ballast as recoverable heat. That only amounts to 90 watts, which isn't enough to heat much more than a 20 or 29g aquarium. The minimal benefit won't justify the risk IMO.