i have always had a need of getting a chiller but didn't have the extra real estate available. so, I plugged in a small table fan. it can usually drop the temp about 2 - 6 degrees. of course you can't set the water temp with the small fan so you have to keep an eye on it and make sure that the temp doesn't drop too quickly.
a fan needs to blow across or down on the water. I probably wouldnt recommend the shark in that sized tank, though. If it's a standard 210, it doesnt have the foot print for a fish like that.
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