Haven't tride it but Ive heard the easiet thing is a jug of frozen water. Just float it in your tank or sump and watch it cool. The jug stays closed so just fresh water in it is good. If you have a little tank a wter bottle might be good. Or medium a 2 liter... etc. Since you have to get that ready you might try some ice cubes in a coupel ziplock bags an immediate solution.
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