25 feet long? You could water ski!
I have 13 tanks with 365 gallons between them running in the house right now, with an increase of $50 per month in electric, most of it for heaters. Heaters totaled up equal 1550 watts. Your tank is just about 10 times the total of my tanks, but one continuous body of water. If you use 5 times the electricity for heating, you are in the $250 range. I would consider a gas fired pool heater incorporated into the sump you will need for the filtration. Gas is much cheaper than electric.
A 180 is 2100 pounds full, 330 pounds empty. You will be dealing with around 20 times that weight if it is 3500 gallons, give or take. rdd1952 figured 4675 gallons, so you can adjust estimated weight accordingly.
Empty, the tank will be 3-4 tons, that in itself will require riggers, and serious reinforcement of a wooden floor. Full would put it in the 40,000+ pound range. Now you are talking concrete piers sunk down to the slab with a hefty footing beneath that. Tall dollars.
Good luck to you, sounds like you will be spending around $10,000 before the tank even gets wet.
Tolak