I've found that my young longnose gar tend to only eat large quantities of food at night. I add feeders after getting home from work while their tank light is on, but they usually don't eat more than one or two of the feeders. However, when I count the remaining feeders in the morning, I find that there are a ton of feeders gone, and the gar have very full stomachs.
true, but with the snakehead, there's a good chance it is or it will be outcompeted for food.
In addition to the info xander requested, the species of the gar could help determine what to feed the gar at it's current size.