Can you elaborate on not eating every day please? Is this particular to this type of fish? I've always fed 6-7 days a week (never had a Red Devil).Ok.. if I may, and I don't want to come off as preachy...... But, those Tetra sticks are ****. Fish love them because of it, go figure. At her age she really shouldn't be eating every day, certainly not twice per. A stubborn cichlid can try your patience, no doubt, but rest assured they won't starve themselves. Show some resolve and make her eat better. Frozen food is often as much as 75 percent moisture, offers very little in nutrition. Freeze dried on the other hand is far superior. Tried raw fish, shrimp? Live earthworm, mealworm? Virtually anything on the market is better than Tetra sticks. Popular in the mid grade pellet is Hikari or Omega One. High end quality is Northfin or New Life Spectrum. Don't worry one bit if she won't eat. Fish like that can go weeks, no exaggeration, and not eat anything, and show no ill effects. When she gets hungry enough, she will accept what you offer. Make it so,lol!