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Electricity alone can be upwards of $75 or more, depending on local electricity rates (they range around the country from under $.10 a kwh to over $.20, so this really affects the total bill) and run time of the hardware. In texas, you're probably looking at $75, but I've seen some tanks that size cost twice that or more depending on the final config. But I don't think you'd see a ton of savings falling to a 180, nothing that you couldnt implement on the 280. Instead, I'd reconsider some of the lighting solutions, the need for a chiller, and which pumps you run, as these are the drivers in electricity. On my 150 gallon tank, I planned it with a final electrical rate of under $40 a month, which I achieved at the time (though since local rates have increased, that number has increased some as well). Look at the use of fans for cooling and circulation of air, lower power draw lights (I use T5), efficient pumps and powerheads (like the tunze or vortech, both of which have low power draw compared to CLS pumps).
Salt depends on how much you change a month. If you did an aggressive change, maybe $30 a month, but at 20% changed a month you're only at around $10-$15, so salt isnt really killer.
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