Lowest temperature

[CassieTaylorMylo]

Help! My heater was accidentally switched off and the temp of my 500lt tank has dropped to 20 degrees, for about 24hrs. I’ve turned it back on and it is gradually warming back up ... I feel terrible, do you think my pencil urchin, tomato clown, and cardinals will be ok? I have no corals, and the fish are still Swimming about but my urchin doesn’t look happy, his spines have gone kinda sideways. Is there anything else I can do?

 

[Uncle99]

Nothing to do but let it back to normal running temp.
Should be fine.

 

[supernanoguy]

Drastic swings are an issue. Gradual cooling should not kill them since you rectified it quickly. Should be ok.