I remember one time I put my pair of clowns in a quarantine tank in my garage overnight and completely forgot to connect the heater, so when I went to check on them about 5 in the morning before work they were literally pale n stiff barely floating upside down. Quickly turned on the heater and about 10 to 15 mins they started swimming like othing happened except with some ick ��. I forsure thought they were goners.