Some Darts are just shy but a change in vivs can promote it. It stresses them out and will take time for them to get used to the new conditions. Some darts are just hiders and never venture out in front of you.
If your room tempis anywhere in the 60-75 degree range I wouldnt consider any type of heat source and even in the 50's they do ok as the lighting above the viv can raise temps without you knowing it.
Michael





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