When I first got my budgies they were chubby and practically flightless, sleeping most of the day. Their now flying, climbing, playing, shouting and appear healthy but they've lost weight, they still have the occasional power nap but not as often. I've had them for a week and they've reached a stable body mass that's similar to my last budgies. They eat well, having a food dispenser and bowl so the feed is always available, a treat stick, millet spray and I offer them veg but I don't think they eat it.
I've checked their poop and it's healthy.
Could it be the gain in activeness that has caused the weight loss?
or do I need to find a new feed? they eat Trill 'Nutrivit'.