With @scottw selling his 300 gallon for a great price, even though I have no where to put it except a storage unit, it's tempting to scale up. However, it's all the other stuff that gets you and it would be helpful to know what to expect cost wise. Anyone running something in the 300 gallon range care to share their monthly expenses? It's additional salt, water, supplements, consumables, etc.....I assume at this level there are also humidity concerns requiring additional consideration and heating/cooling capacity, electricity for all the pumps, lights, etc. Is a generator a must at that level as well? How much time a week for maintenance? With my 90 and 40 gallon tanks, it seems like there is always something to do.