What water temp is too cold for my seedling?
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Ive never had issues right out of the tap
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Are you running the DWC or top feeding at this stage? The above surface temps and RH are more important 78-82/65-75% 
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68 to 70F is the sweet spot for reservoir water temps.
@Myfriendis410 or @HappyHydroGrower can probably tell you what the lower limit is.
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I wouldn’t go below about 65F if possible. Lots of air in the solution too!
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Most wont go lower than 65 degrees, plants will grow with lower temps, but basically the temp dictates the plants metabolism. Plant likes it best at about 75 degrees, but its a balance between what the plants like and what bacteria doesnt like.
With this being said there is a group of bacteria that likes temps 65 and below, then some groups that like 70 and above. This is where the 66- 68 degree sweet spot comes from.
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