Sorry to hear you lost 10 eggs, those aren't good numbers! Hope mine will do better, but it's difficult. I actually just tried with an old USB fan I still had laying around but then the temperature kicked up too high everywhere (40C). So I had to remove some things to lower the temps, but THEN...
Are there any downsides to using a fan inside a small DIY incubator? Right now Im not using any fan, because frankly its a really small one (old computer case). I tested out the temps and it seemed stable from where the eggs were. But I did it too hastily and now realize only the middle eggs are...