1000!! wow. LIVE or DRIED. dried mealies will last a long time, LIVE mealies need to be put in the frig and will only last a few weeks. Mealies are about 1/2 to 3/4 in long and pretty thin.
I buy 500 mealies for 12 gliders and they usually go bad before I get all of them fed out.
I give out about 4-5 mealies every OTHER day. I have seen some websites that say more is ok, I have seen some say keep in small amounts as mealies are all FATTEN.
With GUS who is active and skinny 100 grams I give a little more, with Gizmo and Link who are more fat 160 grams I give less mealies.