Jestersix

[Urgent] How low of a temp can a freshwater tank drop to safely?

Hi all! My inkbird is alarming and I’m stuck at work until 6pm. Current temp 74.8 set temp 78. Stocking includes zebra loaches, a pleco, various corydoras, American flag fish, pearl gouramis, and amano shrimp. How low can their temp drop before I need to call out and rush to buy a new heater?
 
P. phenochchilus, frontosa, hillstream loach
300 gallon with 10 gallon with over 100 fry (6/14/22 hatch)
Temp drop to mid 50’s
NO Fish loss

This was involuntary
Yet VERY amazing
 
Thanks all!
I was able to send a family member to petco and walk them through swapping out heaters via FaceTime. Tank is back up to 78 and the fish seem ok. Another win for the “dead fish alarm”!
 
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