Depends how much bigger you're going. I'm expecting a change of about $200-$300/month once I upgrade from my 180g to 450g. That accounts for the extra water, utilities, supplies, and insurance.
You can also cut down some of the extra costs by buying used equipment, and picking more enegy efficient models, and being conscientous of how long your equipment is running; e.g lights on for 12 hours a day or 8.
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