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This morning on my stationary bike, it was my first go on the bike, and I was on it for a good 30mins. Going at a steady speed of 25-30k (im assuming km/per hour) It said I burned 700 calories?! I highly doubt this but am I doing it correctly, or am I reading something wrong?

Ive set it up, ready for my fish in one week (they said I had to let the water filter, or something like that) its a cold water tank. here's my question. When cleaning my tank out, should I empty the water and refill it again? cause If I did this, the water would become contaminated again? or...