Couple more questions if I may, my Naga chillis sound hollow, is that normal? Also, the ones I grew outside that I think are most likely Cayenne, they have been light green for about a month but some new ones are coming through dark green, which is the healthier colour? I presumed they would go lighter until yellow then go red from there. It's the same with my Naga, a couple are a really dark green the rest a sort of pastel colour. Pics below: