Feeding young angelfish

Question
I have a 100 gal planted tank with nine small(quartersize) freshwater zebra angelfish. I've discovered they are very picky eaters when it comes to the different types of flake foodI've tried feeding them. My tank parameters all in the normal ranges with 7.2ph, I do 30% water changes weekly. During these water changes I've noticed my angels will hit at swirling gravel through the clear tubing of my siphon. Does this mean they want live food or is it a common behavior? If you suggest live food please tell me what kind and where I can find it. Thanks for personal time and advise.

Answer
It's pretty natural for fish to chase anything that looks like it's moving.  You CAN feed them frozen foods (brine shrimp, etc.) and give them treats of live food.  Look up Angelfish care and you can find great menus for them.  Feeding in this way changes things up for them and keeps them happy.

I hope this helps.  Good luck!