what do you mean by impaction?There are some ingredients in some substrates that may lead to impaction in a dart frog. Coco-fiber (EcoEarth) is not one of them.
It is more the manner of feeding than the presence/absence of gravel. If you fed the frogs with tweezers in a manner that prevented them from eating the gravel with the food item, then they will never impact despite being kept on gravel.same thing as humans as i was thinking, but in the frogs correct. thanks for the info. so are you saying that gravel as a substrate can encourage this>