My bobwhites are just over a week old. All have seemed healthy but all of a sudden, I've had 2 deaths in the last 24 hours. My broader is a 20 gallon long aquarium and I've recently started using pine shavings that I bought at Tractor Supply. Do you think that the pine shavings can be the problem? An aquarium in pretty unventilated so thats the only thing I can think of. I have a cage outside that I'm thinking of moving them to. There will be more ventilation so maybe that will help. Also it's larger - they need more room as they're growing fast! Has anyone else had this experience? Do you think I'm on the right track in thinking that it may be a ventilation / respiratory issue?