So I picked up two today- one 2" popping kok and the other about 1.25" already half faded. Employees at the store said they were getting flake, NLS pellet, and feeders. They won't touch Hikari Cichlid Gold. Granted, they've only been in the tank for a few hours. At what point should I get worried? These are relatively small, and I'm a bit concerned about them getting malnourished if they skip feeding for a day or two...